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Thank you all for your responses so far!
The guitar solo itself is fairly slow but sounds really like a rock style tune but lasts for like 10 seconds (from my memory).
It’s definitely an instrumental other than literally a few “buh” sounds made by a human voice.
I think I heard it on a P&O advert though I could be wrong. It sounds quite different to Zadok the Priest in that where Zadok has the violin swinging between two notes, the tune in thinking of starts off low for a couple of seconds, goes lower pitched for a second then fairly quickly goes higher pitched then goes back to the original note. The tune itself sounds fairly similar throughout as regards to the beat and tempo except it uses different ranges of notes. After the “buh” (which I think is literally just a human voice saying “buh” a few times) which I think happens a couple of minutes into the tune, it goes higher pitched but the beat still stays the same. Then, I think maybe a minute further into the tune, there’s the little electric guitar solo before reverting back to the violin.
From what I remember, the little sequence of the voice making the “buh” sound and the electric guitar solo only happen once in the entire piece.