I've tried applying for this match, and was prompted for ID validation - for which the link they sent to complete this sent me back to the initial page. Their support (email only) does seems to answer at around 5am each morning UK time, but seem unwilling to help beyond resending the original link again, apparently their systems can detect if I am eligible so well it won't even allow me to complete the process.

This is a shame, as the offer is very good, so I'll await one more chance from support before giving up!