Rubber boot splitting?

[Teckie]

Hi

I just sent my X5 into the dealer for servicing and I was told that the technician did a check on the vehicle and found out that the rubber boot to the drive shaft (? ) is going to split. Apparently the replacement cost of the boot is insignificant (£12) but the labour costs is upwards of £800!!

I bought a BMW insured warranty which incidentally cost me £900 a year to avoid such added costs but apparently it may not be covered because its a "wear and tear" item. Wanted to see if anyone have any thoughts on this... whether it should be so expensive in the first place, whether this should be covered under warranty (the warranty was bought when the car was 52,000 miles, the car is now 54,000 miles - I'm sure they should factor the wear and tear element into the premium when I bought it?), whether I need to worry much about a split rubber boot in the first place.

Thanks!!