I did my PPL at EGSG. Can't fault their instructors. All very professional.
Saturdays & Sundays are really busy though, getting booked in can be tricky.
You can go from zero hours to a full CPL IR Multi with them.
Plus the have a Firefly G-BYOB so you can have some fun doing aeros.
Only down side for me was the non flying staff & general company attitude. Despite spending thousands of £s with them over the years I never felt like a valued customer. Reception staff have always been (at least since I started flying in 2001) incredibly rude & offish.
I eventually had enough of their attitude & went elsewhere.
Have experienced flying schools/clubs at Andrewsfield & Southend and had a much more enjoyable experience.