Same where I live. The accent changes dependant on where in the valley you live. The computer has thrown a big red blanket over most of South Wales. Cardiff accent is totally different to where I live.
Imperial Airways also briefly ran the Short-Mayo composite flying boats during 1937-38. It perfomed the first non stop East-West crossing of the Atlantic by a heavier than air aircraft in 1938 with a time of 20 hours 21 minutes at an average speed of 144 mph.
regarding accents...as a young lad in training everything I said started with "but" or "mun", and my training sgt who was green howards said "young +++++ by the time you leave here in 15months I'll have fucking knocked that out of you. bless him.