I think you are more likely to find anti-English feelings in Wales. Don't forget though that there are for example people living in Wales who rember being punished in school in thier native tongue, etc.

Also, in more recent times in certain areas, there has been bad feeling about wealthy people (typicaly English) buying holiday homes and pushing prices up beyond the reach of locals. This problem is not unique to Wales though, pats of England suffer this way to.

All that negativity over with. I think North (I've not lived in other parts) Wales is a lovely place to live, and overall very welcoming to "foreigners" like myself.

I think from English side, the most common tale I hear about the Welsh is walking into say a pub and the conversation suddenly changing to Welsh as soon as they walk in. I can't convince myself that (regularly) happens. The Welsh people I know who do speak Welsh as a first language in the home, with friends etc. switch to English if joined by someone like myself who doesn't speak Welsh.