Hi, I learned with a well-known Flying School at Redhill. I started with one instructor, and because I wanted to fly 7 days a week had to do some flights with another. Lucky I did. The first instructor had a really aggressive, intimidating style, and I hadn't realised how much harder that made it to learn, until I flew with the second instructor, who was a tremendous teacher, and has subsequently become a good friend, even though he has moved on to airlines.
The second Instructor took me right through to PPL, although I occasionaly flew with a third instructor. This was REALLY helpful to me. I learned stuff I hadnt learned off my regular guy, simply because his teaching style was different, and he covered the syllabus in a slightly different way.
So. My advice would be :
1. First find a School/Instructor you are really comfortable with
2. Fly with other instructors occasionaly - for me it was a really positive experience
Hope this helps.