I had an AST that ended about 5 years ago. It was in a great location (West End of London) but in a very poor state of repair (the kitchen, bathroom, decor and carpets were all original features - house was built in 1950s or 1960s) which meant the rent was suppressed. Various people had lived there over a period of 5 to 6 years and my name was the last one on the AST.
About 2 years after I left, I got a letter from solicitors claiming £32,500 in dilapidations including a new kitchen, bathroom, carpeting and decoration!
I had to laugh. I reminded the solicitor in writing of a number of points of law, not least that their claim was illegal and timed out. I never heard from them again, which is a shame as I was ready to counter sue for harrassment.