Yes, but I come from an area that got stuck between the two, it's referred to as 'Wenglish'. In the history of things it will turn out to be temporary. We should be speaking English correctly, and Welsh correctly, but as our accents are also a signpost to where we come from, there's nothing wrong with speaking an educated, cultured English, but with a Welsh accent; Richard Burton being a good example. I have a f/b friend who speaks many languages, he has chosen to go for an area dialect in each one so that you could mistake him for a native. These days even Eton pupils try to avoid speaking with a received pronunciation. However on his basic point I suppose he's right; personally it's my way of affirming my South Welsh valley identity when conversing to English speakers, so that they are left in no doubt as to where I'm from, if there is a doubt I tell them MERTHYR; it should also reflect my personality, there's no way that I could speak 'posh', it wouldn't be me. Horses for courses.
The response was an example of an Irish language activist speaking Irish with his home accent, but who preferred to speak the foreign tongue with a received (posh) English accent. It's a good argument and technically correct in a perfect world, but I for one couldn't do it, I wouldn't want to lose my Merthyr accent, I couldn't be a la di da, especially in front of my friends. Coming from a working class background I'd feel as though I was betraying my heritage; the Irish political background is different.