I was at Sytner Nottingham today having my X3 serviced so thought I’d enquire as to the cost of the above for my up and coming INS2 Service, £117 was the answer so I called Sopers and they were about £90 with 10% discount, had a look online and ECP were £87.99 with some extra ‘ rubber bits’ I’m sure they’re needed
anyhow phoned them up and they told me the kit was £59.40 all in and would be with them after 3pm today as it wasn’t in stock, anyhow just a heads up really if you need the kit 
) I've bought from BMW. Namely brake pads and sensor cables - fromt amd rear. They only reason for that being that while not having to pay for labour - yours dearly has done the labour here! - i thought itd be good to be able to show BMW receipts as in whem it some to resale.