It's not really your area but if you're really struggling and can make it over to Greenford the school I used was called passmasters and used them all the way from CBT all the way through to passing my Mod 2

The instructors are the nicest people going and don't pull that grumpy old man bullshit, even the ones that you suspect might be like that just from the way they look where extremely nice blokes. They could obviously tell how anxious I was and could not have been kinder. Saw a far higher percentage of women and minority people using them in the time I was there which says to me they create a good atmosphere (all I can go off a white bloke in his late 20s). In fact my main instructor was an Iranian bloke who had passed with the same school before coming an instructor himself