They tried everything possible to not sell me one of their own chargers rather than the BMW charger which I wanted. They even falsely claimed that their home charging unit is the same as BMW's. Eventually, with help via BMW customer services, I managed to get what I wanted from them but it was a real frustrating experience. I think BMW should warn BP of its responsibilities given that they are the only company which at present authorised to sell BMW charging units. Having said that, the actual installation was eventually done smoothly by BP's subcontractors. I should also point out that the BMW charging unit is completely different from BP's unit and it works absolutely fine.