The Original London Walks* - Guided Walks

http://www.walks.com/

£6 - or £5 for Super Adults (65+), full-time students, and Discount Walkabout Card holders.

Ones I've done:
- Jack the Ripper (Great but very crowded)
- Little Venice (Excellent)
- Regents Canal (okay)

Anikka did loads last summer!