There seem to be conflicting opinions here, but I hope i am able to solve it.
All companies (non-private sellers) pay VAT to the UK Gov't on sales.
However, some companies do have an arrangment with HM Customs & Excise (to whom they pay the VAT) cam reclaim this, for goods shipped out of the UK. However, not all companies habve this arrangement, thus, some companies charge VAT, whilst others will refund it.
The best course of action is to ask first, before buying, if VAT will be refunded.
If a company says no, then they don't give a refund. They are not obligated to do so.
Some companies (such as AmigaKit (plug

) do givr refunds. Give them your business

Do be aware, however, that you may well have to pay tax on the goods when they are imported into your country. Check out your own Customs Department to find out more/.
Hope this helps.