American Husband has flr, in the Uk, can we book a holiday to spain???

not sure if this is a daft question or not, but my husband s on his 2 year FLR due to hopefully be changed to ILR in January, but we was wanting to fly out to Spain to see family out there, and was just wondering if he is able to do that with his passport, i would have thought so, but a few people have put doubt in my mind, so i thought i would you guys here

His visa is multiple entry so there's no reason why he can't travel outside of the UK.

Sure he can.  Who has said he cant?

lol it was actually my mum (who knows EVERYTHING) lol it was only because her husband is from Tunisia and until all his visas were done, he wasn't allowed to travel around, only to and from Tunis, and he was also not allowed to go on the British planes, he was only allowed to use the Tunisian and french airways for some reason.
I just didn't want book and pay for all the flights, and then waste the money, or worse, jeopardise his visa.