Help required with postcode Zones

Please help!,
I am having problems setting up shipping for postcode (zip code) zones in the UK.
Some of my items MUST be signed for on delivery.
Royal Mail 1st class, Royal Mail second class and Royal Mail Parcelforce24.
We have 3 postal zones for Royal Mail.
Zone 1 is UK mainland, whilst Zones 2 & 3 will encure an additional charge for orders sent by Royal Mail Parcelforce24.
When I try to test an order, it keeps displaying Zone 1 charges as well as the alternative (Zone 2 or Zone 3)
I have tried using the Auctiva help using wildcard* but this does not help me with UK postcodes as all of our postcodes start with 2 letters then a number. Does anyone know how to exclude certain postcodes from a shipping zone.
Watches are one of the items that can only be signed for; if you wanted to see what result I am getting.
I hope this makes sense. if any one in the UK has achieved this, your reply would be most welcome.
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