Tbf guys i don't think 50 Pounds is unreasonable for a decent solid dome R2 these days.
I've seen C8 ones go for 50-60+
Consider that a similar condition Yak fetches 200+ then i don't think it's bad at all.
What are the numbers out of curiosity? It always seems to me that it's easier to find a Ysk than a decent chromed R2.
Wanting to buy:
Star Wars store displays
Clash of the Titans