Thanks! 
I actually thought about doing it in team colours, but then I didn't really like those colors and felt a bit like cheating
The U did strike me as a bit odd indeed as I haven't yet seen Holdsworth frame numbers with a letter in front (so I thought people were simply not quoting it).
It is definitely early '80s (83 probably as you said). But will wait for you to come back to me on that (appreciated).
I also thought the BB woud be too short
I do have another one (the one that came with the group parts from Mr Gumpy), so I'll probably resort to use that after a good cleaning.
The new parts that arrived are all shiny and polished, I'll have to do the same to the other parts before fitting them! Ugh!

I actually thought about doing it in team colours, but then I didn't really like those colors and felt a bit like cheating

The U did strike me as a bit odd indeed as I haven't yet seen Holdsworth frame numbers with a letter in front (so I thought people were simply not quoting it).
It is definitely early '80s (83 probably as you said). But will wait for you to come back to me on that (appreciated).
I also thought the BB woud be too short

The new parts that arrived are all shiny and polished, I'll have to do the same to the other parts before fitting them! Ugh!