Hi, i have an ebay shop selling gifts and home acessories, we may be moving to Spain in 2 to 3 years and i am worried my business will not survive, will i lose all my uk customers because they won’t want to pay to have the items posted overseas, many of the things i sell are personalised and very precious so signed for is really needed and will be costly to my customer. Any advice on postal services i could use would be appreciated and if anyone is in a similar situation i would love to hear from you.

You could check what postal services are available in the area you are thinking of moving to. In our area we have a local store that handles mail and everything is posted from Gatwick 3 times a week. This might not be ideal for urgent items but if you work out your listings to finish the day before mail is transported to Gatwick you may be ok.
Myself personally I would prefer to buy from the country where I am living but that is just me.