It is still alive and well in Sarf London anyways.......but like you said Fay, alot is probably used widely now.
Here they seem to have even shortened the slang, for the words used alot. And all the following are everyday expressions ...

"'ave you seen the boat on that?"...boat as in boat race for face.

"I spoke to 'im on the dog."...dog as in dog and bone for phone.

"He's got some gregory."...gregory as in gregory peck for neck.

"Lost yer bottle?"...bottle as in bottle and glass for arse.

It is necessary to drop all the t's and a few h's. I love hearing the newer ones used in context, Del Boy does have alot to answer for, but it is humourous.