Brake is an Avid BB7, with a genuine Avid Post mount and Avid rotor.
I'm not sure on the fork as it's a bit newer than the Bombers I'm used to seeing. It doesn't look big or beefy enough to my eye to be a 66 though.
It's a 1994. Serial starts U4 but what's the full number please? Just curious if it's older or younger than mine! Might also help to see if frames were made in batches. Ta!
Same as this one .... https://www.retrobike.co.uk/threads/what-have-i-bought.3553/
It's quite possibly a UK Merlin but yet to positively identify a 1995 bike such as yours. Fairly confident that a YM97 numbered bike is a Merlin so this is probably one too.
I could do with more Merlin frame...