I second Archie's mention of Ben Law's place. He has gone down into folk history for his house. It featured on an episode of Grand Designs, and caught a lot of people's imagination, not least because it only cost him £28,000 to build (plus a lot of hard work and help from friends and volunteers), not including the land which he already owned.
But there was, apparently, a ten year battle with the planners before he got permission to build. The PP was conditional upon the fact that he worked the woodland for a living, and also required that if he ever moves out, the house has to be destroyed (I believe this latter condition has now been lifted).
I would guess that the most famous UK project that has attempted to find an alternative way through the planning laws is Tipi Valley in Wales, which started in the early '80s, and has been one long battle with the planning authorities ever since. But they are still there, having survived countless enquiries, planning appeals, court orders, and other attempts to get them off the land. The residents there own the land, but their right to live there permanently has always been in dispute. The person who set it all up in the first place was Brig Oubridge (sp?), who I believe is the man behind the Big Green Gathering festival.
Another well known example is
That Roundhouse (very interesting site), a hand made, cobwood house in Wales. They too have been threatened with eviction orders for many years, but it seems now that Pembrokeshire has had a change of policy regarding low impact building, and That Roundhouse
may get a reprieve after all.
I recently heard about
Caroline Berry's strawbale house near Glastonbury. She, too, has had a planning battle, though she does seem to have found a narrow route through the minefield. Unfortunately the house was recently burned down (apparently there are suspicious circumstances - and ironically, the straw walls were the parts that survived best). She is now required to reapply for PP all over again in order to rebuild her house.
The topic of living hidden away in the woods has come up on here before, and I'm sure many people have thoughts along those lines. The trouble with agricultural land or forestry, is that it is next to impossible to get PP to change its use into residential land unless there is some major government-level scheme for a whole new housing development. I have a friend with a smallholding, but it is land only, and he just cannot get permission to build a house on it; even if he could there would almost certainly be conditions requiring that he can show he is employed in agriculture, and will derive a livelihood from the land. This may change as the village it is in develops and grows, but this is a distant prospect. I guess it must happen in places, but it is rare. You may have more success if you buy somewhere with a derelict house already on it, so there is already evidence of established residential use. But in this case the land will be valued higher accordingly, so it may not be the answer to your problem.
There
are people who pursue an alternative, but the risks are high, and in practical terms it is probably impossible to do it completely hidden away – you will need to have access to your home, maybe including vehicle access; you will have to mix with the local community for some things; what will you do about a postal address; what about water supplies and waste; keeping warm in winter will require fuel, and even if this is locally collected wood, you will still make smoke which may alert officialdom to your presence. And if you go so far as building something, are you up for a decade or two battling with the authorities (and maybe even the locals, too), and will you be prepared to see your home torn down if it all goes against you?
Personally, I'm coming round to the idea that getting a few like-minded people together, and combining resources is the only way forward in today's insane property world.
I've just Googled
this site, which looks mighty interesting. And of course the
Diggers And Dreamers site (and book) may be interesting to you, as may the
Co-Housing Network.
I've also just seen that the links page on the That Roundhouse site links to SS-ish!
Edit: mended the broken link to the Co-Housing Network