[leigh kitchen]

Definitely w/m not chromed?
Churchill says the King's Crown bi metal collar was worn chromed by Regimental Police but the one your showing looks flat topped Victorian and not originally bi metal?
Even so, if chromed, an old badge used by RP?

Edit - I should have said Churchill the chromed collar is thought to have been used unofficially by the RP in the mid 1950's.

Churchill states that the ORs of the 3rd and 4th Battalions were formed from The 2nd and 3rd Royal Surrey Militia in 1881 and most probably wore a white metal version of the regulars collar.
The regulars collar of crown shield and star was introduced in 1894 as it was for the Militia officers in reversed colours silver and gilt.

The 3rd Surrey Rifle Volunteer Corps became 2nd Volunteer Battalion on 1/12/1887.
Their first collar badge was a w/m version of the regulars shield only badge.
In 1894 the crowned star in w/m was introduced.
War Office Patent Book shows them annotated "For 2 V B E Surrey's" and "as approved, Horse Guards WO 9th March 1896 under Authy V/2/31/23 from a specimen submitted by J & A Pearce & Co, 28 Floral Street, Covent Garden, London".
Following the change of monarch a Kings Crown version was worn until 1908.

So, after that trip around the houses, looks like it's 2VB if w/m, possibly 1950's RP if chromed.