@lucky jim I can vouch for Martyn and his team at Guildford LCE. It's slightly above your theoretical budget, but enquire if they have a Nikon 8x30 M7+ in stock (that's the M7 with field flattener) and maybe use that as a reference binocular whilst testing others. They won't have everything on display there, so if there's anything on your testing list which isn't on display, just ask. I've done a lot of business with them there, it's a good shop.I've found London Camera Exchange on the Strand to be knowledgeable and happy to get lots of models out of the showcases for you to try. Park Cameras just off Oxford Street have a smaller range but are also very helpful.
I can also vouch for Park Cameras' Burgess Hill store, if you fancy a drive down the M23 beyond Gatwick. It's a big showroom. Their warehouse is there, so if a particular binocular you're interested in is available online, they'll fetch it for you to test, even if there's no shop demo unit on display.
Probably worth a phone call to either or both stores before making a journey, to check what is or isn't available for you to try. Both stores will permit you to take binoculars outside for testing.
The x25 Terra ED's are both terrific and good value for the quality of their optics, but I'm in the camp which suggests going for a slightly larger aperture binocular, a x28, x30 or x32, probably in 7x or 8x. But whatever you decide, try, try, try before you buy!
Good luck!
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