BGB and LAL both sound great (much more interesting than LEL) but the timing isn't ideal. BGB is half term which is a bit of a no for me, and LAL is a bit late if you want to do something else.
Audax-wise there's also the Inverness 1200 in September which I have half an eye on.
APN if I get a place and considering Transpyrenees, if I can get on it.
Having read the latest Arrivee the Bristol-Glasgow-Bristol route sounds suitably daft, and I might ride KWCC's London>Anglesey>London