This is all very interesting. I've just registered as a sole trader for two parts of our smallholding - holiday cottage and vineyard (i.e. the potentially profitable bits). I've also registered for VAT and did my first return in November and am just preparing my second one now. The reason for registering was that we can get all the VAT back for the building work on the holiday cottage and the vineyard set-up costs. I did phone up and ask and all seems to be OK - there was no mention of a five year limit BUT before they paid my first VAT claim, they were quite thorough in checking me out including wanting to see a business plan, a list of all the receipts included in my claim and copies of the top five by value. They also phoned up our builder and apparently gave him quite a grilling on our plans. We will be making a profit within the year but it will take about twenty years for them to get their money back which I thought they would question but seemingly it's OK. I imagine they'd have a problem if I waited a year and then asked to deregister!
The vineyard was a bit of a lucky break because when I initially asked about that on its own I was told I couldn't register that for VAT until we were ready to be in business properly i.e. selling wine but when I went into the details for the holiday cottage, I found out that we couldn't reclaim VAT for services received more than 6 months after the service was delivered. So by the time we produce wine, we'd have been miles beyond the point of being able to reclaim the costs of planting the whole thing in the first place (most of the cost is in the labour). By rolling the two into one business, I've been able to reclaim all of those costs now.
I haven't included other smallholding stuff in the business and my understanding was that that was OK although I must admit I didn't go into a great deal of detail with them over it. I sell eggs and honey which are both zero rated but also poultry which I'm not sure about? None of it makes a profit and the sums involved are tiny so I don't imagine they'll lose much sleep over it....
H