Paula like you I am amazed at how easy you can obtain the radar key, as you say anyone can have one. When i applied for my blue badge, which i had to supply letter to prove i needed this, from consultant / surgeon or GP i asked all 3 as you never know who will answer, in the end i got 3 and sent all 3, i got the badge, whoops sorry this is a bit long.
I also purchased a radar key as i was in wheelchair at the time, i must admit i never used it i never came across a toilet needing one, the loos in the shopping centre where i live closed down, ha ha so its a cafe or a pub.
Toilets are a major issue where ever i go as i always need to loo when out.
I do hope there are plenty where you live, and that they are clean! lol lol