No we're not Petal. All joking aside, you are asset rich, and cash poor. You have
assets that far exceed the assets of the average family in the UK.
I found your posts amusing in that you don't seem to understand that you are objectively well off, because you define "rich" only on the basis of disposable income and not in terms of the
assets you have or the choices you have made that reduce your access to your disposable income (like paying interest on a large mortgage).
If you need to at some point, you can always realise a capital gain by selling your home and moving somewhere in London where house prices are cheaper. That may not be something you
want to do, but you do have access to that value if and when you choose to access it.
You may not feel rich, but you have a lot more than many other Londoners.