I'm 5'7" and about 15 stone (208lb). Last year I was lighter so lots of my clothes don't fit any more
They're pretty much all UK 16s, with a few 18s thrown in. At the moment the 18s fit, although some items are too big, while most of the 16s are too tight. However, I have a pair of size 16 Primark jeans which are a touch too big if anything, and which I wear all the time.
Here in Spain, the biggest sizes you can usually find are a 42 or a 44 (UK 14 or 16 supposedly) and they come up incredibly small. Last year I was 13 stone and on the smaller side of a UK size 16, but I couldn't even get a pair of size 44 jeans over my knees here!