From the Tesla Blog:
A Peace of Mind Guarantee
The Tesla Motors Team March 11, 2015 We recognize that many European drivers prefer to lease their automobiles, personally or through their company, so we now offer the Tesla Resale Value Guarantee in all 11 European markets where we sell Model S.
The Tesla Resale Value Guarantee, when combined with a loan or a financial lease from select partners, combines the security and comfort of ownership with all the advantages of a traditional lease. Like Model S, we designed the program to provide maximum benefit to customers. Tesla guarantees that the resale value of Model S between months 36 and 37 will be among the highest of any premium sedan made in volume.
Along with peace of mind, customers benefit from numerous cost savings including compelling monthly payments, market incentives, the ability to use Tesla’s Supercharger network for free, long distance road trips, and zero petrol costs.
This is similar to the US resale guarantee which it announced in May 2013 which reinforces Tesla’s reputation of innovating every aspect of the car ownership experience.