It's a soap - so any selblence to reality is tenuous at best.
All the usual issues spring to mind -
If they own houses withing walking distance of a tube line, why are they not all on the market for eight-figure prices?
Why does Phil own three businesses and still live with his mother?
Why does no-one have a washing machine?
Why does Shown always look like he needs a bath?
The list goes on and on.
It's best to simply accept the nonsense before you and either watch it, or not, but analysis is right out - the whol eddifice crumbles within seconds.