In message , Clive
writes

I know I'm most probably on the wrong group and am therefore willing to
be re-directed, my question is this. In a few weeks time I am coming
to London with a 4 year old boy. I am presuming he'll want to "go"
about every half an hour, where can I get a guide of toilets in stores
or otherwise that would be suitable for my purposes.

The 32 public toilets in the City of Westminster are shown on the map
at:

http://www.westminster.gov.uk/enviro.../toiletmap.cfm

There also quite a few in the City of London, although I couldn't find a
map.

As others have said, most major tourist attractions and department
stores will have at least reasonably good toilet facilities and all
restaurants are obliged to have toilets. Facilities at railroad
terminals are not always as good as one might hope!

I don't think you will find any of this a problem so long as you take
preventative action by passing a department store, restaurant or tourist
attraction (and there are an awful lot of all three!) at the sort of
frequency required by a 4-year-old!

--
Paul Terry