If I still had something to offer them, such as in the way of easy money, things would definitely change once again.
This is precisely why they have turned hostile towards you. Presents have always been expected, especially from family living outside of poland. Not just any presents, but really nice and expensive things. So it's not surprising to me that your family has shunned you when you stopped sending them presents and invites to the UK. This was very typical of poles in the 1990s, not so much now from what i can tell.