Parkfell, I’m a Polish citizen and at the time when I was applying for the WAPA programme, I have been living in the UK for over 8.5 years.
At no point have I experienced any issues related to it, neither during application nor during the training itself - your Polish citizenship is more than enough and you simply don’t need any other residency card.
If anything, solid English language skills you gained there might help you to achieve ICAO English level 5 (lifetime aviation English cert) and definitely some subjects will be easier for you to comprehend.
Hawker400, I believe this is not a discrimination but rather a restriction originating from the loan issuing subsidiaries. I might be wrong, but it’s probably something similar to e.g. German bank not being too keen on giving 45k loan to a Polish who just appeared in their country without any track record, banking history etc. - simply too little of debit collecting power for them to have enough assurance they’ll see their money again.