Never tried that squatting style of loo myself, though I have previously heard that squatting is supposed to be more hygienic than sitting since gravity apparently is supposed to help the process
In Britain there are a few things are useful toilet wise.
Firstly, most public toilets are maintained by local councils, so if they were amazingly grotty you'd have a recourse of someone to complain to. So while you might need to be careful of loos in places like bus stations and the like, most loos you find in shopping centres etc are relatively well maintained, and if your uncertain you can always wipe the seat as Ironcross said.
Also, manifestly loos in restaurants and places where food is served tend to be good since otherwise people would kick up a stink about it if you see what I mean .
The most helpful thing if your visually impaired in the Uk though, is using disabled toilets (especially if you have a guide dog).
Any registered disabled person in the Uk can apply for a universal disabled loo key. These are keys which only disabled people have and which open disabled loos. This means firstly your in a room on your own and can take time finding your way around, secondly don't have to worry about multiple people, or multiple stalls, and thirdly that the loos tend to better maintained since less people use them.
They're also really handy if you need to give your guide dog a drink or some food on the go as well, though manifestly you need to be careful where in the actual room you do this since you wouldn't want to be right next to the toilet itself.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)