I wish you all the best with your hopes and your housebuying but I'm afraid I think it's all a big con (possibly quite a legal one).
If properties are genuinely available below market value, they tend to go to auction where they get picked up by genuine professional investors/landlords.
Any that don't go to auction will be picked up by the estate agents or the professional investors who will pay the estate agents a backhander I'm sure.
I'm sorry if this sounds harsh but I think it's naive to think you can easily just pick up a property below market value when there are people on the inside who will reserve the bargains for themselves and their mates.
If it was eay to just "flip" a house for £10K and it was genuinely worth £10K more then there are plenty of investors with a lot more cash than you have and with relationships with the agents.
Sorry I think it's a con (or legal loophole) and I don't think you are getting the genuine bargain you think you are.
But I wish you all the best with it.