Public rights of way maps can be found at https://www3.rbwm.gov.uk/info/200215/rights_of_way/1017/definitive_map_of_public_rights_of_way
The maps that relate to WSL are maps 7,8,9 and 14.
Public Rights of way - Milestones Report 2016 - 17 here.
Gritting - roads and RBWM's policy can be found via the following link http://www3.rbwm.gov.uk/info/
Wildlife sites in WSL - click here