Thank you P&P  and Andrew.

I just had a Cheetah rear  supercharger housing vapour blasted and there is a “muckle” big SR part number on the block. Momentarily confused what it had to do with Saunders Roe -before recalibrating.

I also have a Valentine tank part and data plate that are Vickers Armstrongs – just need to head up to Cragside to see William Armstrongs house.