Recommended outlets for second hand binoculars/cameras? (NE Wales / NW England)

For camera equipment you could try WEX - Manchester or Birmingham probably closest to your part of the world, though their website is the best place to look for the widest choice www.wexphotovideo.com/.../
MPB.com are also good (website only I think) or London Camera Exchange (who have various branches www.lcegroup.co.uk/.../ )
Not sure about optics, most I know are in East Anglia, but you might find an In-Focus closer to you https://www.at-infocus.co.uk/