Here is the page, quite clearly shows including vat (first item brass sheet) £3.83
https://www.cornwallmodelboats.co.uk/acatalog/brass_sheet.html (https://www.cornwallmodelboats.co.uk/acatalog/brass_sheet.html)
Then here is the submit order page....
REF | DESCRIPTION | QUANTITY | PRICE | COST | REMOVE | | | | KS251 | .010in Brass Sheet x 4 x10in (https://www.cornwallmodelboats.co.uk/cgi-bin/ss000001.pl?PRODREF=KS251&NOLOGIN=1) | | £3.89 | £7.78 | | | | | Subtotal | £7.78 | | | | | Shipping (UK Standard Delivery) | £2.50 | | | | | VAT | £2.06 | | | | | Total | £12.34 | Notice how the price per unit has increased over the advertised page unit cost - only 6p but still its increased, and then vat added on a second time. No removal and re- adding of it, just plain and simple being charged vat a second time.