This is a list of hiking clubs/organisations I walked with. You might wanna check out their sites and do one of their other walks.
AAA London Group (Meetup): charged guided walks, weekends, holidays and other outdoor activities around London, in UK and abroad
Cancer Research UK: fee-based charity walks around London and in UK
Capital Ring Walk: free self-guided walks around London
London Escapes (Meetup): free and charged guided walks, weekends and holidays around London, in UK and abroad
Natural Born Hikers (Meetup): charged guided walks, weekends and holidays around London and in UK
Outdoorholics Bite Size (Meetup): charged guided walks, weekends and holidays around London and in UK
Saturday Walkers Club: free self-guided walks around London, in UK and abroad
Saturday Walkers Club: free self-guided group walks around London, in UK and abroad
Toubkalguide: organised treks, climbs and excursions in High Atlas and Saharan Desert in Morocco
Walkfree Breakfree: free and charged guided walks, weekends and holidays around London, in UK and abroad
Hiking Madness - Hiking in UK and elsewhere 
You guys are a Ramblers group, right? How many people are on each walk?
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There is one walking club you’ve missed: Central London Outdoor Group http://www.clog.org.uk/
We are a friendly outdoor activity group for people living in and around London. We are happy to welcome anyone who enjoys walking, cycling, exploring our countryside and other outdoor activities. The club is run by its members for its members. All members are welcome to organise events.
We typically have around four to eight events every week. You are welcome to attend three events to try out the group; after that we ask that you join. The membership fee for one year is £15 for new members.
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