Yes indeed!
Sorry, I should have said in my previous reply that it wouldn't apply to two or more starred failures. I understand that now. I have been told that it can loosely be taken that starred failures generally apply to landing distance increments as a result of higher approach speeds and non-starred are generally the result of stopping problems. Hence the reason that two non-starred items need to be multiplied (e.g. spoilers & anti-skid) as there effects are compounded in the attempt to stop. If you have two starred items you will be using the highest approach speed indicated and therefore the highest landing distance factor on it's own will cover it's effect. (I realise that this logic may not apply to every combination)
Many thanks for your help. Now I can get on with being confused with some other subject!
Cheers,
CP