Hi wreck we sell both Claud Butler and Cuda bikes, they're both made by Claud Butler. Both good bikes, will do more than one ride before breaking! The 18" is an odd 'gap' size, sort of thought up so you need to buy another bike to bridge the gap between traditional sized 16" and 20" and tend to be outgrown very quickly. If he is really tall I'd try to get him on a 20" with gears (it will just be 5 gears, but will help his little legs going round like fury) by Christmas. That said, my 9yr old is still fitting a 20" so you'll need to sit him on some bikes to check sizes. As long as he can get his toes down he'll be good especially if he's confident.
When I'm at the shop later I'll go on the b2b site and see how keenly they've got those bikes priced! We sometimes struggle to beat internet prices, even if we charge trade plus vat, so will check!
Got the massive munchies last night, ate a lot of biscuits! First binge in two months, so I'll take that. I was oversnacking every day before. The stuffed massive courgette was truly delicious, and we had a handful of tiny new potatoes from the front garden. They need a bit more grow in them, but were very nice.