This is the Bramley Apple series of 29 puzzle caches by PuzzleClub, a joint account for Hofficoffi, RichieCactus, ===sgb and TheBignells.
The photo includes Lamoutarde, RIP, a founder PuzzleClub member.
Left to Right: TB, HC, RC, L, SGB.
We have enjoyed solving several puzzle series by other cachers, in particular Famous Eccles and the easier ones (!) by Mr Cryptic, so we have decided to jointly set a loop in our own vicinity of caches that are (meant to be) challenging enough to be interesting but not insurmountable (there are too many puzzle caches around here that are intractable - and some of them are owned by us individually!).
There is no particular reason for the apple graphic & theme, but since we were basing the icons near Bramley, Surrey, then why not...
The series is a loop which can be started anywhere and done in either direction. Two convenient free car parks are Bramley station (N 51 11.331, W 0 33.046) and (when no services are happening) the Shamley Green Church Car park (N 51 10.818, W 0 31.409). There are shops, pubs and cafes in both Bramley and Shamley Green, so supplies and meals should not be a problem. We estimate 4 hours to walk the loop, plus searching time plus eating time at some suitable emporium.
You have to cross the A281 twice. It is a busy road, be careful.
Apple 28 is a bonus cache and uses data from each of the geochecks of the other puzzles in the series.
The cache is not at the posted co-ordinates, solve the puzzle below to find it. 
The Puzzle:
A = 
B = 
C = 
D = 
E = 
F = 
G = 
H = 
The Location:
The cache may be found at N 51 1(F).(D)(H-E)(A-D), W 0 3(G).(A+F)(B+E)(H-C) .
The cache is a 200mL cliplock box seeded with a cat. Hint in geocheck.