Firstly I have lived here for 15 years and am married to a canarian and speak fluent Spanish with basic German and French. Its a fantastic island to live on but as a few others have pointed out there are some pittfalls but these will all depend on you and your attitude to your life here.
Make sure you do everything legally !!! as in if your husband is going to look for taxi work or minibus pick ups,, please remember the locals are here before any of us and you should try to work alongside them, not against them.
I agree with sunshine,, dont completely give up your UK connections,,, if you dont speak fluent Spanish medical help can be a minefield of having the right paperwork. it can be frustrating here sometimes.
And also some else mentioned about trying not to behave as if your on a permanent holiday,,, there have been a few deaths here amongst the English in the last couple of years because of alcohol abuse,, idle minds and not enough to keep you busy.
Think very seriously first,,, make connections here of people who can help you,,, and look into the job situation,, as everyone is aware we all suffering the credit crunch and Tenerife has been seriously hit with businesses going under its sad but true.
I wish you the best of luck and hope you fall in with the right sort of peple here.. STUDY WHAT SOME OF THE PEOPLE HAVE SAID ON THIS PAGE,, THEY MEAN WELL,, AND WANT YOU TO ARRIVE WITH NO ILLUSIONS.