Bright-Ling,
Yes we were airways and cleared from KOK to DET to BIG. Only called prior to BIG and TOLD to descend out of controlled airpace due to the stacks at BIG being busy.
We weren't offered any options just descend and contact Lon Info as Thames Radar was too busy also. Did a freecall to Farnborough and they provided us with a RIS.
Re. approach into LM - we were planning to divert to Oxford but as we passed over Reading we broke out of cloud and into some poor vis and then headed for LM.
Like I said, didn't want to have a go at anyone but felt that things could maybe have been handled a bit better - as you suggested maybe an alternative routing or the option of a hold?
I don't know what the solution is with things being so busy in the area, but when you're cleared all the way (BIG - BLK - WOD - EGLM) it would have been nice to get a bit more notice or maybe a plan B?