First time I've quotes myself haha, but for example, you could nest two flights to Malaga

For an example although various dates available at same cost;

Fly out revenue and back avios (RFS) next Saturday 10th June and then fly out avios (RFS) and back revenue.

Cost for the Revenue in I is £211 for 3298 Avios and 160 TPs
RFS 6500 + £35
so for 3202 net Avios, you get 160TP at 1.5375 £/TP.

You can do it as a one way too, e.g. next saturday again...

Cost of revenue outbound flight £93 again booking into I netting 80TPs and 1649 Avios.
Return RFS 3250 Avios + £9.78

So for 1601 net Avios you get 80TPs at 1.28 £/TP.

So actually, thinking about it, cheaper to buy two outbounds than to nest.

Obviously no need for accomodation costs for either if your Birmingham based.