Capital gains tax on land sale

Hi everyone, I've recently received planning permission for a land which I own in conjuction with my 2 siblings. This comes upto to 3 acres in total. We have not had it valued yet, but estimate it may be 100k per person. I also know that there will be a hefty capital gains tax to pay if I sell it outright on the earnings. My brother in law has proposed that he keep the land and pay me an interest on my share of the money (approx 100k) according to bank of England rates, thus potentially avoiding capital gains tax. He is essentially wanting to build on the entire land and make a profit for himself, while keeping me on as an investor. Is this a sound plan? Or should I be looking into other avenues ?