So your quite happy to endure a 3to 4 hour train ride to London, drag cases down escalators and half way down Euston Road to the cramped Hammersmith and District LuL platform ride to Paddington with a bazilian commuters and nowhere for your cases for 25 bumpy and uncomfortable minutes with the adventure and high risk of standing all the way!
Finally get fleeced on the worlds most expensive transport service to Heathrow
Three cheers !
By the time you board that single flight to Bangkok - your already over Iran and beginning the descent but far enough though whatever rocks your boat.
Personally even in a bath chair (Biz seat or coffin with telly) my own threshold and i'am a seasoned traveller has long been 5-6 hours and I seriously want off !
I manage the East Coast okay but going East always fractious but each to their own i suppose.