Just had the first service B (£875). The first B service has a transmission oil and filters service which is then needed evert 75k miles by the look of it (£300 or so of the cost).
Was told that the interval was 1 year (the car and the App and the web say 2 years). They suggested service plan which is 12m includes 2 services (so that would be an A and a B I guess) but the cost now is £80 per month. I think the V Class service plan is aimed at high mileage chauffeur type. Our van is relatively low mileage.