Test kit came without freepost envelope

#1

I want to send back my test kit but I don’t know how to send it back because I never got a freepost envelope included in my kit. Alternatively I’ll just send it by royal mail post but does anyone know the address that I need to send the test to?
@Dr_Paula

#2

Hello @orange_tacos

Just send us a text and we will send you an envelope.

Many thanks

Paula