Sorry, but at under Ł15k you will not get a Sadler 32. However, there are vast numbers of sub 30 foot 70s/80s boats on the market, but few are serious for living aboard for long periods - even for one, unless you are very basic. Suggest you just go and look at a variety and get a feel for what is on offer. Many of the performance orientated boats will be very cramped and more spacious boats less good performers, but mostly safe and steady. At the end of the day condition and equipment is probably more important than the specific design.