Don't know about that, but I've been living here for almost 2 years, so I HAVE to get a license if I want to drive. You only have one year from the beginning of residency to use your State license and afterward you're driving illegally if you don't have a UK one!
Always check up on the DVLA site for yourself before succumbing to rumours you might read on here! I don't see why you couldn't apply for a license immediately, especially if you're resident here. But that's just my opinion!
Also...I sent off my application on Monday and it was received by the office, so hopefully within three weeks I'll be provisional! Hopefully I won't need too many lessons before I can take the test.