Need a till which can be remotely accessed / possibly cloud?

Yes, it's called Google

Seriously though, no of course there isn't. There are so many different EPoS solutions out there, and so many dealers, that it would be impossible.

If you're looking for a new system and haven't run a business before that needs EPoS then it's often worth wandering round similar businesses (smaller ones, not the big chains) in your local area and seeing what they've got, having a chat with the business owners, and getting a general impression - both of the system they have and also the company they deal with - so you can get a shortlist of three or four systems/dealers to look at in more detail.