We had our offer accepted in June, no chain either side, it's all been really straightforward.
All the searches are done, queries all answered, happy with HBS.
Mortgage agreed, gift info supplied, valuation satisfactory.
We returned all the signed docs special delivery to our conveyancer on tues, although due to her internal post she only got them today 
Yesterday she said all she is waiting for is confirmation the mortgage co [Barclays] are happy with gift info - it's from my Aunt, she sighed the waiver document & our financial advisor already submitted it to the mortgage co with the original application.
We need to give 1 month notice on our current rented property but can only give on the last day of the month, so Monday - if we miss Monday we can't give notice until 31st August which means another month here which I reeaaaaallllly don't want!!!
So our dilemma is, do we do the 'right thing' and not hand notice in until we've exchanged, even though that will probably mean a delay of another month - even in we exchange on 1st August we can't agree to complete until 2nd half of September due to doubling rent/mortgage costs.
Or do we chance it & hand our notice in on Monday anyway, on the basis that everything is done so there is no conceivable reason why we won't exchange & complete in August...
It's unlike the agent will market the house straightaway (they're pretty shit) so if we haven't exchanged by the end of the first week of August, we could ask if they would extend our notice to the end of September? We'd be a bit buggered if they said no though 
Help!!