Working two or three jobs to buy and live in a tiny studio seems nonsensical. You setting up long term problems stress.
We only worked that many jobs for a set period of time. As soon as we were able to afford the flat then we gave up our extra work and bought it. What would have been nonsensical would have been to throw our hands up in the air and give up. Who knows where we would have ended up. I think I would have been more stressed if we had not done what we did.
Our problem was that with our combined salaries the highest mortgage we could have got was about £10000 and the tiniest studio when we started saving was £14000. The studio we ended up buying was £17000. So we had to come up with £7000 + extra expenses.
Sillyoldfool I think in your situation I would continue to rent where you are if your rent is cheap and your kids are settled in school but start looking at property for you personally not to move into. Look for something that is relatively commutable to London, that needs a bit of work doing on (usually a lot of these places need a good clean, a few cans of paint and new carpets. Some might need a new sink taps and worktop and some might need a new toilet and wash basin and tiling, all can be bought cheaply off Ebay etc) Then do the place up and then sell it.
This sort of thing www.rightmove.co.uk/property-for-sale/property-52083748.html
You could be looking at anything from £6000 profit which you can then plough into your next property until you have enough money for your deposit on the property you can move into.
Remember nothing in life is easy and sitting around stewing over what might have been does no one any good.