There are loads of differences in radio calls between ICAO, the USA, the UK, and some parts of Europe.
None of them are major in a "safety" sense, but there is enough there to make you fail the otherwise trivial 24-question JAA IR "IFR Comms" exam if you didn't work through the question bank
They also change from one year to the next, here and there.
For example under ICAO you "climb
to two thousand feet" whereas in the UK, and in most other European countries, the word "to" is omitted for obvious reasons.
But at the PPL level there is nothing significant. Anyway I suspect remembering the radio calls is not the biggest issue for the typical 10hr/year UK PPL
