OK, here are some ideas for you, I hope you will find them useful.
First rule is to diversify your portfolio, it is not wise to keep all eggs in one basket, and in your case to keep all money in cash savings and bonds. Instead diversify your investments and invest in these 3 core asset classes: a) cash;

stocks and shares; c) property.
Here is how you could do this wisely.
Cash:
1. Invest in a ISK money market fund in Iceland - those funds yield 16% per annum without risk (apart from the exchange rate rate risk GBP/ISK). To open such account, you need to get a Kenitala (Icelanding social security number), Kaupthing bank will arrange it for you - just contact them and say you'd like to open a custody account with them (kaupthing.net), they will give you instructions. Once you have Kenitala you can invest in a ISK money market fund with any bank in Iceland (not necessarily Kaupthing). You will get a safe 16% a year and your only risk is that Icelandic Krona (ISK) will drop to sterling (GBP) more than 10% a year every year, which is unlikely. On the other hand, should the Krona strengthen to pound, you will earn much more than 16%!
2. Open a savings account in Australian dollars - the interest rate you can get exceeds 10% per year and the currency is likely to increase in value. Australia exports lots of commodities to China and Asia and has strong fundamentals as opposed to the UK. You can easily open a 10% savings bond with ICICI Bank Singapore via the internet and post (google ICICI bank Singapore).
3. Keep some cash in sterling - open a bond in the same bank (ICICI Singapore) that pays over 8% per annum on their 3 year bond, alternatively a 7.10% bond in Landsbanki Guernsey. With the ICICI you have the advantage that your savings are in Singapore - that means the bank will not report you to HMRC (regarding tax on the interest).
4. Open a few "regular saver" acounts with some UK banks as they offer some of the best interest rates, i.e. Alliance & Leicester pays 12% p.a. and Abbey pays 10%. But you can pay up to £250 every month, so best if you have 3 or 4 of those. Find the best ones on moneysupermarket.com
Stocks and Shares:
1. Although we are now in the bear market, there are many good investments available on the stock market. Do your research on www.iii.co.uk and find 4 to 5 stocks from different sectors that: a) are large companies;

have stable profits year after year; c) pay high dividends above 5% per year (i.e. if the stock costs 100p it needs to pay over 5p in dividend); d) have good P/E ratio (below 15). Once you choose your companies, don't invest everything at once. Buy a little bit once every two weeks or every month, if you have 20K to invest, buy £2000 worth of stocks once every month for 10 months. In this way you will reduce the risk of buying too high as those stocks that you will buy higher will be compensated by those that you will buy lower.
2. Invest in Hong Kong and Taiwanese stocks. Here is why: both Hong Kong and Taiwan have their currencies pegged with the US dollar so their interest rates have to be in pair with the USD (i.e. very low). But the economic situation in HK and Taiwan is completely different to that in the USA - they have strong growth and very high inflation while US goes through recession. People in HK/Taiwan can take loans at 3% p.a. while inflation is 7-10% - in such scenario it is no brainer to take massive loans and save as little as possible (and spend more money) which is good for the local companies which make huge profits. So find a stock brocker in Hong Kong or Taiwan, select and buy there 4-5 companies based on the criteria in point 1, and i can almost guarantee that within 3 years you will be at least 50% better off.
3. Gold is now a good commodity to invest in and it goes up in value quickly. But the problem with gold is that unlike stocks, property or cash, it produces no income. Gold will pay you no interest, dividends or rent... But, if you are smart, you can have both - gold and income. How?
Buy stocks of the gold mining companies. They make profits, which they pay as dividends to their shareholders, while price of their shares are hugely determined by the price of gold. In that way you can kill two birds with one stone.
Property:
1. Perhaps you did not think about investing in property when you were selling your home, in the end of the day you have escaped from the falling market. But I strongly suggest you reconsider it. There are some excellent property investments available, e.g. auction property. I have been going to auctions for some time now and I have seen commercial premises producing £5,500 per year sold for £18,000!!! That's almost 30% per year in rent alone. You can get fantastic investments on auctions, from cheap residential council flats that produce 12-25% per year, to shops and other commercial premises that produce between 15 to 30% annualy! Go to www.propertyauctions.com and choose properties that produce significant income, go to auctions and bid on them. Buy in cash and remortgage later on good terms (i.e. 60% LoanToValue) - you will pay 6% mortgage but tennants will pay you over 15% in rent!!!
2. Look abroad for great opportunities, e.g. Germany. I am not sure whether you are aware that you can get a modern 45 square metre apartment in Berlin for £25K or a whole block of 15 peroid flats for refurbishment in Leipzig for £20K... Go, check yourself on the internet: www.immobilienscout24.de (German equivalent to rightmove). Germany is the world's biggest exporter, the largest economy in EU and average earnings are higher than in the UK. You can easily buy flats between € 15K and € 40K that are already rented out for years and produce 10-15% per year plus the growth potential. I suggest Berlin, Dresden and Leipzig (3 largest cities). Germany is now at the bottom or very soon after the bootom of the cycle - quite opposite to the UK as we are just after the top.
Whether or not you will use my tips, good luck with your investments!
Deos
Here is how you could do this wisely.
1. Invest in a ISK money market fund in Iceland - those funds yield 16% per annum without risk (apart from the exchange rate rate risk GBP/ISK). To open such account, you need to get a Kenitala (Icelanding social security number), Kaupthing bank will arrange it for you - just contact them and say you'd like to open a custody account with them (kaupthing.net), they will give you instructions. Once you have Kenitala you can invest in a ISK money market fund with any bank in Iceland (not necessarily Kaupthing). You will get a safe 16% a year and your only risk is that Icelandic Krona (ISK) will drop to sterling (GBP) more than 10% a year every year, which is unlikely. On the other hand, should the Krona strengthen to pound, you will earn much more than 16%!
Looking at GBPISK - it was 120 ish a year ago and is not around 155, so around 30% down. So you are gaining 16% interest but it is devalued 30% pa. Do you think the outlook is any better for Iceland going forward? The credit markets would suggest otherwise, but I'm sure you knew that.