In Scotland there have been quite a few cases of people being attacked because they're English, or being attacked because they're wearing an England football shirt or something equally retarded.
However, in Wales there seems to be significantly less overt aggresion towards English people. Obviously, there's tossers everywhere, but I haven't heard many cases, if any, of English people being attacked in Wales simply because they're English, and I can't imagine anyone wearing an England football, or even rugby shirt in Wales getting any trouble providing he didn't shout about it.
I also can't imagine many Welsh people these days having any profound resentment towards English people, of course, you might get drunk idiots who start going "English bastard", etc, but I don't think there is much in the way of profound hatred for English people and I think these days an English person could live in most places in Wales and not have any trouble.
Don't get me wrong, I'm not against the Irish or the Scottish, but I have noticed there is a significantly higher proportion of the population in NI and Scotland who dislike the English, and as we all know, in NI it is often extremely violent.
Some of the issue with Scotland is there are a growing number of people in Scotland who I would describe as "Little Scotlanders', who think they should close the border to any English person.
Not so many of these people exist in Wales, ok, I know Wales has Plaid Cymru, but their main concern strikes me as being to protect and maintain the Welsh language. They don't strike me as being anywhere near as obnoxious and biligerant as the SNP.