I would avoid grass airfields. They are a pig to find unless you either know the area, or use a GPS
Also I would avoid ultra busy places like Stapleford (especially on a weekend) because they can be hard work. I recall going in there a while ago and got cut up from the left, then went around and got cut up from the right, with these planes apparently having instructors in them too.
Exeter, Bristol, Shoreham, Lydd, Manston, Plymouth, etc.
Ones near the coast are easier to find because they are on the coast
Once you get your PPL you will use a GPS anyway.
Got to keep this game enjoyable.