I'll be spending some time in London shortly, but won't have access to my punting browser or phone, so I reckon the best bet may be to call on spec at somewhere like Hod and take a chance. I gather there are 3 locations; can anybody tell me where, at least roughly? I've asked them by email, but had no reply. The nearest tube stations would help, at least.
Also are there any similar places where you can just turn up and see who's on offer? Any advice would be much appreciated.