I certainly think it's an important area, worthy of research. I do agree with Thomas that FC and Adoption need to be treated completely separately- finances are very, very rarely going to be the reason someone chooses one over the other.
I suspect the adoption area may be the less studied and the more fruitful. Some random thoughts for areas of investigation are:
-To what extent is adoption a middle class pursuit? I suspect finance and other issues become quite big barriers to very good parents adopting once you get below a certain income.
-How random is the allocation of adoption allowances? I would guess the answer is: very. Probably varying by LA and pushiness of adopters, rather than the factors it should vary by.
-A lot of money flows around the care system in relation to a LAC. Almost none (as a proportion) is used to support adopters. Although I imagine studies of pre and post adoption support needs have been done a lot before, though certainly not acted on (probably used as toilet paper in Conservative Central Office).
I'm North West based and would cheerfully contribute.
I'd be interested in any information or sources of information on payment to adopters as this isn't something I've heard about at this, very preliminary, stage of my exploration of the subject.
Does this mean that you don't yet know what funding is potentially available to adopters?