Not so much rs but often th turns to f ... that is regional I believe ... it's spreading though!
Yes, the f for voiceless th and v for voiced th have been going on for a long time. I believe it has spread from Cockney (via Mockney) to so-called Estuary English. It's nothing to be alarmed at. Happens all the time. Currently in American English there is a vowel shift taking place in the north-central states. I haven't heard it here in California yet.
Rs lost sometimes in February but that is just the diffuculty of r after the bilabial
I think it's the two rs in a row that are the difficulty. Oftentimes, one is dropped or dissimulates, like in pilgrim from Latin peregrinus. Anyway, I believe *Febuary pronunciation is quite common here in the States, too.
Do you hear it with other r after bilabial stops? For example:
bing for bring
bat for brat
pobably for probably
You get the idea ...
