More than 1,000 police officers from 25 police forces were deployed for the NATO summit which was held on the outskirts of Watford in December.

Figures obtained via a Freedom of Information request show the scale of the operation Hertfordshire Constabulary and the Met Police jointly led at The Grove hotel.

US President Donald Trump was joined by world leaders on December 4 for the major event,which was the biggest pre-planned operation in Hertfordshire Constabulary's history.

There was a large security cordon in place as police patrolled on the ground, in cars, on bikes, and in the air.

A breakdown of just how many officers were on duty and from where can be found below:

Monday 2nd December 2019 - 313 Hertfordshire, and Bedfordshire, Cambridgeshire, Hertfordshire (BCH) collaborated police officers and staff + 174 officers and staff from other forces (487 altogether)

Tuesday 3rd December 2019 - 496 Herts and BCH collaborated police officers and staff + 418 officers and staff from other forces. (914 altogether)

Wednesday 4th December 2019 - 525 Herts and BCH collaborated police officers and staff + 627 police officers and staff from other forces (1,152 altogether).

The police forces involved in policing the NATO summit in Watford were as follows:

Hertfordshire, Bedfordshire, Cambridgeshire, Met Police, Thames Valley Police, Hampshire, Derbyshire, Kent, South Wales, Northumbria, Cleveland, Durham, West Yorkshire, North Yorkshire, South Yorkshire, Humberside, West Midlands, Warwickshire, Staffordshire, West Mercia, Norfolk, Suffolk, Lancashire, Greater Manchester Police, Merseyside, and Cheshire.

Meanwhile, Hertfordshire Constabulary is still calculating the additional costs it incurred for policing the NATO summit. The force confirmed it would be be applying for compensation.

A spokesman for the Foreign & Commonwealth Office confirmed in December Hertfordshire Constabulary can apply for additional funding.

The Police Special Grant allows police forces experiencing unexpected or exceptional costs to apply for additional funding, with any application "carefully considered" in line with public guidance.

The spokesman added that the Home Office is currently engaging with Hertfordshire Constabulary and the Met Police on the NATO programme.