You should be okay, like I say, I can count on one hand over the past 6 months the number of times that they have been an old seat configured aircraft - I think your chances are nailed on and if I was a betting man, I would have £100 on it being lie-flats!!
I only made the list because that is the route / flights that I fly and was interested myself.
Now, if only they would offer a 3 class product on the flight(s) from BHX...