My bike is in the hands of my LBS now. The mechanic there noticed the chain was missing straight away and was like "Whats your story then?". I explained to him what happened, He inspected my broken chain and told me the quick link/release had broke.
I had another new 10 speed ultegra chain with me at the time and he was about to order one. Since the broken chain still had a lot of life in it, agreed to take the new chain as part of the payment & give my bike a mini service which cost about £30 which should iron out any issues with the bike caused by the tumble.
Should be ready for pickup tomorrow since it wasnt a huge job.
good result there.