hmmm i can be quite stingy, so this is what i would say

A500 / A500 + £5 - 10
A600 = £10 - 20
A1200 = £20 - 35
A1000 = £20 - 40
A2000 = £60
A3000D = £80
A4000D = £100

see... told you I was a skin flint... this obviously does not include postage.