Yeah - we've got a large mortgage, but have plenty of savings. It's going to be interesting to see the impact on house prices in London. Leaving EU = bad for house prices, Crossrail = good for house prices. I can imagine ours will decrease in value over the coming years, but I don't expect it to be too dramatic.
The wonderful thing about all this is when we come to buy our holiday homes in the regions in a few years time - Cornwall, Lakes, etc. - we're be able to get them at a song, because the regions have just voted for placing further austerity measures upon themselves and local economies will suffer... (...I'm joking
)