Hi, it's nice to see new (and old) people interested in this. Thanks for thinking of me!
We have 6 months funding from Nominet to extend our map, which began this month. The aim is to stop focusing just on open data (which is patchy and non-standard) but to crowdsource, and also trawl council sites ourselves. This includes importing and displaying all the OSM toilets. Like toiletmap.org demonstrated, the OSM toilets have lots of locations but not other attributes (like opening hours), whereas council webpages have this information but no efficient way of mapping the locations ("toilet located behind beach huts" is one description I've seen). So we want to match these two data sources, and build on it. All data gathered will be submitted back into OSM.
There are also increasing numbers of community toilets (ones in local businesses that are paid by the council) which can be added, and I like the idea of people adding themselves to a database like Give Me Tap which I've not seen before. Hopefully we'll be able to create an open database that is reliable enough for the public to want to help maintain and improve it. Then others can also make their own toilet-finding apps that meet different user needs.
I'm afraid I can't talk about how we're do this as I haven't a clue - Neontribe do the software side. They seem confident, but we'll also need lots of help!
I'd love to talk more about the OSM data (online or in real life); it'd be great if various projects compliment each other. I'm keen to include as many attributes as is useful (and to make sure we get the right data type for each one), but realistically there's a limit to what people will complete, so we also need to get the right attributes - so on a side note it would be really good to hear what information people with prostate cancer might appreciate.
Does that sound Ok? Please let me know if you think we're going about things the wrong way, as we only want to improve the OSM data and make whatever progress we can towards a decent useable UK database of public and community toilets.