meshiey - that comparison (£25 electricity vs £110 diesel) was purely the weekly fuel cost. Savings (in London) are more than double that once the non-payment of congestion charge and the expected lower maintenance costs are allowed for.
The interview you refer to is in that link above (post 429).
BBC London News reporter was Andrew Winstanley.
TNT spokesman was Engineering Director Steven Davis
Tanfield/Smith spokesman was ceo Darren Kell
Email for queries: enquiries@tanfieldgroup.co.uk