well the seller of the cup responded with :
unfortuntely i cant replace as we dont have another in stock, it is in the nature of hand made ceramis to have small flaws, and i did test this one with boiling water before i sent it out,
im happy to send a fresh set out if you will cover the postage.
cheers.
kinda happy kinda annoyed, its nice they offer to replace, but annoying as it should never have gone out, had i have been in a shop and picked it up, id of put it back down,
now need to find a black 54mm funnel that fits