I still rent a flat, since 2003 or so. The rent hasn't gone up, at 800 since I moved in. I saved a pretty large amount in that time (I'm paid £60k/y, my wife too), and that allowed us to raise a 35% deposit on the property we bought recently (250k), it also mean the mortgage is one of the best one can get, and were already by now 50% paid off on it.
We put all our extra into it, or in one (offset) saving account and (offset) ISA, and we planned to continue renting the flat, since it's actually quite a good deal.. ie a lot cheaper than trying to buy a similar place, we'd have to downgrade quite a lot to continue paying 800pcm.
If you take a mortgage, just realize that roughly, every time you spend £1 on anything else, it actually costs you £1.5. Thats a very good motivation for clearing it ASAP. On the other hand, if you /can/ take a mortgage now, it's the time to do it as your saving are worth /nothing/ with the current rates, and you'd have to have saving that beat the inflation rates to even break even...
As for the OP, I just shake my head in despair. "Start a family" indeed, and teach the family good values...