1. Is it acceptable for my Dr here in the UK be able to fill in the requisition form for me or should I go through you?
Yes, of course!
2. Do I need to be sent a collection kit from Washington university virology or can I send my blood in a SST gold top tube (with blood spun) myself. Along with the form and packaged correctly with ice packs etc and labelled as they state on the Washington virology dep website?
No. You can just have the gold top tube drawn and spun. I hope they will send you a blank requisition form. If they will not, I can send you one