Definitely a step in the right direction. We all love the sound of a V8 or a V12 at full chat but at some point the oil is going to run out. The electric motor is well suited to the type of motoring that most limos are used for with quiet running and instant low speed torque.
As ever the legislators take a broad brush approach rarely taking account of the facts or the practical implications, it was entirely possible for instance to buy an LPG/petrol bi-fuel car with its BIK tax advantages and never actually put LPG in the tank, or even enter the London congestion zone for free in an LS600h and hoon about doing maybe 15mpg. The beauty of this Jaguar is that it appears to achieve the aim of significantly reduced CO2 emissions while still being true to old grace, space and pace strap line.