The Forza one is for 10k miles and the BH 20k which in why it wasn't making sense! At 20k miles Forza are giving a slightly better GFV but the monthlies are £669... Hmmm.
I was flicking between Forza and BH, but the game changer for me was the fact that the GFV of the Forza deal was seriously too high and I was worried I would and up with a car in negative equity when I came to trade it in. Couple that with 43ppm excess mileage and I thought I could end up with quite a bill if I hand it back