What is this plane?

Hi Folks,

I have a request.
A friend of mine reports being westbound on the A54 just about to enter Chester at 10am yesterday morning (30 June) when he saw a large light grey aircraft that he swears looked qa lot like a 747SP with no windows and a large winglets. He’s confirmed it was not a C17 Globemaster. He’s convinced it had a 747 style hump. Definitely a large jet aircraft.

The Beluga comes close, but he recalls large winglets which the Beluga does not have.
He’s not naïve about planes and knows a fair deal, but he is stumped and has now stumped me too. :confused::confused:

Anyone got any ideas?