Me neither. In summary, many eBay UK sellers simply don't and never did offer shipping outside the UK. I feel that the eBay GSP is largely responsible for this.
Some sellers would ship to Ireland if asked nicely but for those that wouldn't, parcel motel type redirection services were fantastic. I used parcelwizard. It was a very reasonable €3.75 per redirected item. They've left the market because of Brexit.
Only An Post are still offering such a service currently, at almost twice the price. And who knows how well it's working. I reckon a lot of people are getting nasty surprises where used eBay items arrive without so much as a declared price and customs are estimating values.