Cheers for that. I've no access to a garage so I may have to drop it to a shop. Would I be better off to bite the bullet now are wait this one out a while?

A stitch in time saves nine. Once it starts you have to keep on at it. Once the rust has been sanded off and the arch repainted it might be worth waxoyling and cleaning/re-doing regularly. Maybe better to try for a decent finish before the winter and road salt etc really get going. Only Range Rovers since 1988

Any tips on where to squirt some Waxoyl?

Do you have to remove the inner arch?
Do you have to get it into the sills?

. Cheers, Greg
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2011 Vogue SE 4.4 with lots of toys in Stornaway

I had read on an Jag XK8 thread that the sills were prone to rusting in a similar fashion and a number of people drilled a hole in the sill which allowed them to inject waxoyl on the inside of the sill and then closed it up with a bung. V8 or else ...

Marshalls quoted me £600 which seems a bit steep!

When you remove the lower plastic side sills there are several holes you can use to spray into and reach all the internal areas - I use Dinitrol products which I’d recommend 👍