Hello

Would really appreciate any help with identifying a new bike I've just bought.

I'm pretty sure it's been repainted over the years, and I'd like to restore it back to one of the colours it was originally available in. But to do that I need to know what it is!

I'm thinking 80s, and the serial number under the bottom bracket is M554 - from what I can make out.

Any help would be greatly appreciated. Thanks in advance!