Oh Giz -
well Devon has phones and email so they could still do it. Fingers crossed.
Clucking bell Lazy what a completely ridiculous situation
Are you still considering breaking the chain to allow your buyer to complete while your vendor faffs around?
As I recall we did have to have proof of buildings insurance last time we moved, perhaps it's not a legal pre-requisite but more a "nice to have proof of". If I were the vendor I would want to see proof because if the place were struck by lightening between exchange and completion I'd want to know that the buyers could still pay up.
Lovely house pulling
Congratulations 
Those sound like fairly important things to need clarity on Stormy - your solc. sounds thorough and also thoroughly hacked off at your vendor's solicitors. Can your EA contact your vendors EA and make the vendor aware that there are all these outstanding enquiries - try and get the vendor to pressure their solicitor?
Bunny I hope your back feels better soon 
Welcome HoneyB you sound as though you have been on a rollercoaster. I'd be very pissed off if I weren't informed that my vendors purchase had fallen through. I guess you only really have two choices - sit it out and hope they find a place soon or start viewing alternative properties yourselves with a view to withdrawing from the purchase. Can you ask your EA to find out more?
Ness - wow, 2 solid blocks of three hours each is awesome, enjoy it while it lasts 
Fingers crossed for you both pixie and perhaps