Tried this – and it comes to £14 currently.

For the record this is by no means the first time this has happened to me. I think you’re being “gamed” by some of these sites. Publishing a minimal amount of discount vouchers to drive increases in traffic.

I’d suggest that you carry a warning for sites that do this sort of thing so I know not to bother in the future. You do this already with the Hut so I think a similar warning would be useful.