A little worry about Richardshills BB.
I think you have had this frame resprayed, so presumably it's been shotblasted.
Have you put a liner around the bearings and spindle? I ask because there is usually some shot blast grit left inside the frame tubes which will, almost inevitably, get ito the bearings and ruin them in no time flat.
I had this experience, but a long time ago when you could go to any bike shop and buy a new spindle for 25p. so it was just a nuisance, not a major expense.
There used to be ready made plastic liners for this purpose, but you will be lucky to find one now since sealed bearings have been the norm for such a long time. I recommend improvising with a round plastic bottle and a pair of scissors.
I've just seen your comment about removing cotter pins. Since you've only just put them in they should come out easily. Support the crank, make sure you hit the pin squarely when using the hammer and don't forget to leave the retaining nut just flush with the top of the cotter pin thread. They should fall out with a single blow.