Neil, the other trick I tried was running during one of smallest's nap, on the basis that wife could more wasily control one sprog. The youngest (almnost 18 months) is now only having a nap at 11 ish, so that does not fit in too well. At w/ends I run at 3pm (ish) for 1-1.5 hrs (although I hope that will increase), and I just have to "leave them to it". However wife is not heavily preggers (or preggers at all, as far as I know!) at the mo' - that clearly changes things.
Also it can help to change your life/reorganise things a bit.
So I have dumped a few responsibilties at work to allow me less stress in getting things done. My switch to lunchtimes means I may have to take a slightly longer lucnh break, so I may have to do an hr at home to compensate, but I shall not have to get up so early, so should still be able to stay up and have a good evening.
Also (yes, it is time for ironing) - I have invested in tumble dryer which leaves clothes less wrinkled, and handed over responsibility for determining what needs to be ironed and what does not, to my wife. This has dramatically cut down on ironing w/out too many horrendously creased items.
I am still a bit nervous about latter, but it will lead to more time.