I admire you for the ability to do this, well done.We do, we need no more than £12,000k a year for everything including holidays in the MH (whatever they are!) and large vet bills. We've been doing this for years and one reason why we retired many years ago (me in my late 40s and hubby early 50s). We find it 'hard' to spend on stuff like meals out, etc as it's not something we've done much over the years anyway and have never desired the 'latest' gadget etc, our last massive spend was the Carthago but that'll be with us for a long time and does exactly what we want (well from what I can remember from last winter!). We may need to spend on stuff like repairs etc and are nearly mortgage free having paid over half of it (£55k) off over the last few months from Bonds, spare income etc. We'll have it paid off totally by the end of the year however it may be as early as May if we can manage it with other Bonds and spare income as we're using 0% long period credit cards by putting everything we can on them (up to their credit limit of course!) as it means the money can then go towards reducing the mortgage (and thus interest payments) and we'll pay the CCs off just before the 0% credit term ends.
It is difficult start spending on stuff because it would be 'nice' to do so, rather than 'need' to, but it's a very difficult habit to break, once the mortgage is gone our annual outlay will be even less.