I've used neither amps but I frequently visit York so I can tell you a bit about the instrument shops there.
I'm afraid it's unlikely that you will get to try them out in York as the shops are all very small and have limited stock. There's 3 shops as far as I know. Banks Music, Mor Music and Rock Ola.
Banks music is a general instrument store next to the post office in town centre selling brass instruments, guitars, drums etc. There are usually about 3-4 Fenders and Gibsons each and about 10 epis and squires. They stock Orange amps but other than that you probably won't find anything interesting.
Mor Music is my favourite. You can get there by turning left at the bottom end of market square (the main street with fountain and toilets), past M&S, and turn right into a small street just where the hat shop and Subways is. They stock Laneys, Fenders, Marshalls and Randalls but no ENGLs I'm afraid. They have Marshall JVMs so that might be worth a try for you. Well chosen product range of Vintage guitars, Hamers, Fenders and Ibanezes. Nice little store with friendly staff.
Rock Ola is on the same street as Mor Music. Just keep following the road and it's on your left after you go past a small bridge. This is where you "might" have a chance of seeing an ENGL. I've seen a 5150 combo, Mesa Roadster, JCM800 and an ENGL Screamer in the pat there. They stock Maverick, Aria and Washburn guitars and a few others. Amp wise, I don't think they sell new amps. Sometimes an odd gem comes along used so it's always worth a check.
You could to ask the guys in Mor to get the amp in for you. But then you'd probably have to pay upfront so it'd be pointless I guess. Your best bet is to take the train and go elsewhere. Newcastle is about 1.5hr away from York and from what I heard have nice shops (Guitar Guitar?). No point coming to Leeds though I've never seen a new Framus or Engl here. Sound Control has Mesas and Peaveys as far as high gain amps are concerned. That's about it.
wow sorry for an essay:roll:
Good luck :twisted: