Thanks all for the encouraging feedback. The pearl has now gone, it fell off naturally actually.
The Admiralty Grey strap is from "Phoenix Straps" in Cardiff, Wales. They were the original supplier of MOD G10 Nato straps. I found this one on eBay.
Also managed to bugger up the keyless works (clone 2836-2 movement), thanks to Sneed12's tutorial I managed to sort it out, all be it briefly! As I also discovered that the pivot post on the "Double Corrector Operating Lever" (bit of a mouthful) had fallen off. I've ordered a new one, also off eBay.