Got a call from what sounded like a busy call centre saying it was Sky technical support and was I having patchy internet connection (I had actually contacted them about this previously.)
Person A took me through the speed test (legit-Sky uses this) and then passed me onto a second person who got me to go to a 'validator' website that showed a series of error messages, which he said he could sort out for me.
At that point I was getting a bit suspicious so I said I had a meeting and needed to call Sky back. I asked him for a reference number so I could pick up where I'd left off. He got a bit shirty about that so I hung up.
99% sure it's fraud and would have led to a download or financial information changing hands. Anyone else had this?