How can we incorporate customer's VAT numbers in UPS shipping post-Brexit?

[Simon_Westwood]

Some of you may know or like me didn't know till today that come September part 2 of Brexit shipping comes into force.  I know UPS are going to send an email out explaining this second of three parts to shipping changes.  On talking to my UPS rep I was stressed to find out that we need to add HS codes or parcels will be sent back.  Not a problem.  But we will also need to give the receivers VAT number if they have one.  Or again UPS will return the parcel.  So my question is, can we add a box in the address line to ask for customers VAT number or can someone think of another way that doesn't mean sending loads of emails out?