Thanks Sherwood and rbmartin. The 176 would be fine if it were not for the snail's pace, likewise the 171.

I like the idea of the Elizabeth line interchange but I will probably be finished in Bloomsbury before December.

The route via Canada Water / Waterloo is counterintuitive as you head off east before cutting back to the west, but it's worth a try to see what works. CW is just such a horrendous interchange in the morning.

Thanks again

BigED