I’d say your route will be a bit more challenging than Swinley and also more fun.
Conditions on the Surrey Hills are variable after the recent rains: the routes on Pitch Hill will have some muddy bits and plenty of slippery roots. Holmbury Hill is more sandy and generally dries out quickly, except Yoghurt Pots which will be full of chocolate yoghurt in the dips. BKB mainly has a good all weather surface.
As a mid level rider (ok on BPW reds but not red+) I’d find all that route ok, although the last bit on El Capitan is a bit spicy.
At the Peaslake shop I much prefer the sausage roll to the cheese straws in the Kamoot photo.