Thankyou all for your helpful replies! I'm in awe of anybody who can work full time AND look after horses / children / sheep / chickens etc at the same time, but incredibly some of you seem to be managing to do just that!
The issue is not so much commitment, but how we get to the point where we
can give a smallholding the commitment it needs (i.e. can we go for it now and build up, or must we wait until we have saved enough cash to 'downshift' immediately).
Egglady - that's a very good suggestion to try to live off one salary, and in fact we've been doing that for some time whilst we save up for a house deposit. The issue is that one salary alone is unlikely to both sustain us AND pay the mortgage.
Let's take
Longcarse as an example (apologies to Rosemary and Dan - hope you don't mind me using your home as an example!). If we were able to buy for say £300K, plus £9K stamp duty, plus £4K moving / legal costs, that's £313K in total. Let's also say that we had been saving for long enough to put up a 25% deposit (

). That leaves a mortgage of £235K, which would cost around £1200 per month (25yr repayment, 3.75%). Unfortunately, that's just not going to happen with only one wage, even if we were able to produce all our own food for free!!

So, that's where we're left. Do we buy a 3 bed semi and save and dream for ten years, or do we go for the smallholding now and aim to build it up slowly. My hope is that even if we ended up playing host to somebody else's sheep for a few years to keep the grass down, we should be able to transition to the life we want eventually.
I say you should bite the bullet sooner rather than later.
Yes Beth, I think you could be right!

Thanks again for all the encouragement folks!