Ok, well I have found the sticker with the barcode that Jamie was talking about and it has YS6G on it at the top, now the YS6 appears on most of the parts too, so is this engine code? apart from that I have found STK on a metal plate (not the Vin plate) and also TUER
can you make any sense of that?
YS6G is a prefix for part numbers,there are 10000 different parts using this code (google ford ys6g if in doubt)
It isnt a sticker or a plate you need to be looking for ,the letters/numbers you want will be stamped into the engine block,they may well be covered in old oils and road dirt.
Is the cost of re engining a 9 year old 1.25 car really worthwhile?