Earl of Stamford’s Regiment of Horse
The Earl of Stamford's Regiment of Horse was a short lived regiment that existed in 1643 and served in Gloucester.
They may have had a skirmish at Burford, but definitely fought at the siege of Siege of Sudeley Castle and the battle of Highnam.
Their cornet is interesting; an old Military Modelling article from the 70s, on ECW flags, gave the cornet as blue with white horizontal stripes (from the Earl's coat of arms); however, the rather succinctly titled 'BL MS Additional [Sloanee] 5247' gives the field colour as solid blue. As BL MS Additional [Sloanee] 5247 was a contemporaneous pattern book of cavalry cornets I have plumped for the solid blue field.