My daughter was excited about its arrival here in Eastern Spain, and insisted we pop into the place that had opened up in Alicante when we were there for the day last year. Another independent outlet has recently opened nearer to us which she and her friends have checked out and copiously selfied.
I think that once you've made it to Benidorm, you can definitely claim it's a mass market thing now.
Only ever referred to as bubble tea here, as far as I know.