Both myself and wife have cash isas with the HSBC, some funds have gone in them this tax year, is it possible to still move them to another provider as the rate with hsbc is rubbish?

You can move them as long as you have not tied yourself into a one year fixed-term ISA, if your interest rate is low that's probably because the rate tracks the BOE base rate so it doesn't sound like you have a fixed-term ISA. You then have to find another ISA provider who will allow transfers in. I would advise you to look for providers that do a one year fixed-term fixed rate ISA. Nationwide do this and offer 6.15% but due to a back-log it may be another month until they open it up to allow transfers in again.

Currently the best rate on a one year fix that allows transfers in is Northern Rock, their offer is 6.10% Does anyone have any opinions on whether this is a safe option? I'm curious because I'm trying to get my girlfriend to transfer her ISA out of HSBC too for the same reason as the OP – shite savings rate!

I opened a Nothern Rock Isa last month transfering in funds and adding to them.

Service was excellent and the transaction was easy.

My ISA's are all sorted (after a long battle with Lloyds over their incompetent transfer process!) but I'm trying to get my girlfriend to transfer her HSBC and Halifax ISA's into a fixed rate ISA at a decent rate (something above 6%). She's 'worried' about sticking it into Northern Rock, I told her she should be more worried about the Halifax!