Although you do need to know whether your customer is in the UK or not, you can collect that through the address. You don't need to know whether the customer is

Although you do need to know whether your customer is in the UK or not, you can collect that through the address. You don't need to know whether the customer is a business - if you're providing VAT receipts then the business in question can claim the VAT back anyway. Often people will deduct VAT at the point of sale for businesses as a convenience, but it's not mandatory or required.