This is the Lancaster Phone Box Number Locator:

We may well expand this to include other cities eventually.

In the meantime:

Isn't it frustrating when you need to know where there is a public payphone or the number of a BT phone box... BT doesn't appear to maintain a public list so I figured I'd attempt to start one. Therefore begining with Lancaster or anywhere else if you like, send us the location (exact address if possible) of your local phone boxes and their numbers and we'll list them here!

On of the two payphones near horse shoe square opposite thomas cook is numbered:

01524 588276

Contact us with other phone box numbers and we'll compile a list!
phoneboxes@upforit.info