You havent got any numbers worng have you?
For example:

100 + 20% = 120
120 - 20% = 96

Where are the finance guru's.

Just about to put my order in for my pistons and crank pulley. Here is me calculations.

All parts advertised including VAT (%20)

Pistons 480 pounds
Pulley 155 pounds

Total 635 pounds less the 20% VAT = 508 pounds, plus fedex delivery 56.13 pounds = 564.13 pounds (maybe add VAT to delivery 67.36)

Total 575.36 pounds (if VAT is added to delivery or 564.13 if you don't VAT delivery)

This is the answer I got back (it's only 20quid and won't stop me putting my order in) but can someone explain how they would arrive at this figure???

It is a little confusing as our prices inc vat but Fedex prices do not, so this is how the figures should look

Forged pistons £480.00
Management pulley kit £155.00
Total UK sale inc vat £635.00

Less Vat @ 20% £105.83

Parts total export no VAT £529.17

Fedex export delivery no vat £56.13

Grand total £585.30

Sorry but it is a little hard to sort out I know, any problems let me know

Nahh Dalmany you have made a mistake in your numbers

You came to 635pound (including 20% Vat) (so it is 20% more than you have to pay, so you have paid 120%)
so:
635/120 (This will work out 1% of the cost you pay)
= 5.2917 (this is 1%)
multiply the above by 100 (because you need to pay 100%)
This will bring you to 529.17

Add postage of 56.13

Gives you a total of 585.30

Hope that makes sense

Easy way to remove 20% VAT is divide total by 1.2, .

You are a genius!!! If you say 585.30 is right then I'm happy with the answer.

Thanks Steve

Do you really need forged pistons? Race engine? Cast omega's take a lot of stick, some turbo guys on Turbominis runing 20 plus psi boost with cast Omegas!

Entirely your choice of course!