Hi coffeepod, very much appreciate the response (and sorry I missed it), and well noted regarding getting this right. I must admit, I've struggled to make sense of my scenario to determine if the developers offer is a good one. Prima facie it sounds great, give up some garden and get a new house, but when I try to make sense of the CGT liability it's not so clear.
The site (which I would give up as consideration for the house) as is, as garden, is worth say 50k, or say 200k if a developer could put a house on it.
If I give it up I get a house which I would have otherwise paid, say 400k to build and it would be worth say 600k when finished.
So am I paying CGT on 150k (200k - 50k) or on the consideration of the new house, and is that consideration the build cost (400k - 50k) or the new house's market value (600k-50k)
These 3 treatments would attract CGT of 50k, 115.5k or 181.5k respectively?