A few years ago I was moving from England to Spain .I had a Firearms certificate in England and had just also obtained a firearms license in Spain.
Having a British F/A license was a great help towards getting my Spanish license and the Spanish did not mind me having licenses in both countries.
I then tried to renew my license in England and despite still having an English address was told that I could not have two licenses.
I was moving house in UK from one police area to another and tried the new force and they told me the same .
I had wanted to share the guns with my son keeping them at his address and using them when I came to visit,so the license would have been at my address and the guns at his.
I therefore did not pursue the renewal and the license lapsed .
I was later told by a couple of people who were firearms authorities (Well known people not someone in the pub on a Friday night,) That this was a problem that had arisen before and the Police were wrong.
To be honest I could not be bothered starting the application all over again and could not be bothered arguing the toss with people who do not know what they are talking about.
They then returned my application fee to an address I had not lived at for 10 years and told me I had to go and collect it even though it was 70 miles away ?
So just a word of warning if you do move abroad keep your UK certificate as it shortens the process certainly in Spain and you can own two certificate as long as you have an address in each country .