Tienda & UK VAT Relief

I have been busy working on a new site hypodiabetic.com that specialises in selling Diabetic products. I use Tienda as the shopping cart for this site. I love Tienda, built from the ground up to work with Joomla while still in the development stages I can see it having a great future.

One unique feature of my site is that the UK government provides VAT Relief for Disabled People, but how do I get Tienda to understand this and get customers to complete the required forms?

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