Just been called by +441655263459 (Maybole, Scotland) and was played a recorded message saying there was a tax fraud case against me and I would be arrested. I hit 1 to speak to an advisor and asked him to tell me my name as there is clearly a comprehensive case against me, he then read off a scripted answer and I asked him again to which I was hung up on. Any chance someone more skilled than myself could mess with these guys because they’re using some pretty nasty tactics.
Sadly the number is no longer in use but you did the right thing posting bud 
In terms of "Skill" I use fakenamegenerator .com for all fake details or use my sudo character "Tony Hutchinson" (from Hollyoaks). I also use the address where Hollyoaks is made and have registered my Skype fake number to that address too. You might notice the picture... Thats on my fake email too ;)
Basically anytime you are on the phone wasting their time is time they cannot speak to a potentially vulnerable person. See how long you can string them along and the key thing is never use any of your own details or own number ;P