It is Monday so...colour me confused, what's this about DUB/LHR/BCN???..
Who are "they"? and how often does this "ferrying" happen?
..and to address the hoary old point about "commuters" and Tax avoidance: living outside the UK does not in itself automatically mean an individual is paying "bugger all tax"..(thinks..that reminds me, I must get back to working on my Tax return later..the non UK one)
Anyhow I fear we have strayed wildly off piste..