"I was at work furing the last full eclipse, but it was pretty eerie standing on a London West End street and it was pretty much silent."

The last total solar eclipse over London was in 1715 - I should have a word about your retirement and pension provisions ;-).
I think I know what you mean though (probably the 1999 eclipse that was total down in the southeast corner of Britain).

With tomorrow's, as viewed from the UK , you won't notice any dimming of light. There's only a small chunk bitten out of the Sun. The weather forecast is typically dismal too, but there might be a break. I've made some safe solar filters for my 10x50 binoculars and I'll take those into work for occasional sneak peeks.