All of the above is great advice, something else to think about is the training environment. I know we as helicopter gods tend to shy away from those lovely folk in the Air Tragic Control building, but most of the above training providers are based at predominantly FISO or A/G type bases, so you dont really get a handle on learning in the rather controlled manner of an airport such as Gloucester or Liverpool where there is total control from Ground up to Radar, which gives an awful lot of practice talking to those lovely people in the tower.
Only mentioning this, as there is some "interesting" phraseology going about out there at the moment, even from those pilots flying with "professional" callsigns from commercial outfits.