I think back in the 90s Welsh wasnt as widespread in South Wales? I know when I visited her in Camarthen it was only Welsh speaking. I may be wrong and actually I could understand my friend quite well as she was very expressive and a lot of more modern words were English.
That's right - more Welsh up North although Carmarthen is the 'Welshiest' of the S.Wales counties - Pembrokeshire further west very anglicized and known as 'Little England beyond Wales.' Yes, a lot of English words used in Welsh (e.g. Microwave is Popty Ping!) My sister in part of a group in Aberystwyth who translate 'new' English words to Welsh. 1997 vote for devolution 50.3% in favour 49.7% opposed ! The Welsh Assembly has a policy of promoting the Welsh Language and the number of Welsh speakers is on the increase. In fact the term Welsh Assembly is being replaced with the term 'Senedd' which is the Welsh equivalent. All schools teach some Welsh and all holders of senior posts - Police and Health workers etc. have to have a basic knowledge of Welsh. (my grandmother remembered a time when her mother tongue - Welsh was forbidden in schools - they had a wooden board with W N stamped on it and any child heard speaking Welsh had to wear it - the one who had it on their neck at the end of the school day got caned.) oops - gone on a bit!
An ex landlord took over a pub in Cardiff and we used to once a year on a bus for the weekend. In the pub itself never any issues, Or if we went out with the locals if we went into town on our own, Women loved English blokes and the Men hated you.