Went through this recently. DVLA will NOT renew, exchange a paper licence for a photo ID credit card type licence or do anything else - including change of name or address - until you've been resident in UK for 6 months and can prove it with approved documents.
If you're considering making a "dodgy" declaration to this effect in order to get the licence, it was pointed out to me that the next knock on your door could be a gentleman in a raincoat from HMRC questioning your Non Resident tax status on the basis of your declaration. Expensive Driving Licence when you can drive on an overseas licence, or an international driving licence, for 6 months.
7B