VCRA section 37, specific defences (does not include airsoft skirmishing)
http://www.legislation.gov.uk/ukpga/2006/38/section/37
Those purposes are—
(a)the purposes of a museum or gallery;
(b)the purposes of theatrical performances and of rehearsals for such performances;
(c)the production of films (within the meaning of Part 1 of the Copyright, Designs and Patents Act 1988 (c. 48)_see section 5B of that Act);
(d)the production of television programmes (within the meaning of the Communications Act 2003 (c. 21)_see section 405(1) of that Act);
(e)the organisation and holding of historical re-enactments organised and held by persons specified or described for the purposes of this section by regulations made by the Secretary of State;
(f)the purposes of functions that a person has in his capacity as a person in the service of Her Majesty.
So the easy answer is there is no legislation permitting airsoft use, let alone at a single, multiple sites or any time period
But various sections give ‘the Secretary of State can....’ and this is how the Skirmisher defence is provided
Don’t have to hand or quickly findable the quotes/references on the additional info for Airsoft, but recall it as recognising skirmishing at site’s with public liability insurance as a permitted activity
WHAT ARE THE VCRA AND THE SKIRMISHERS DEFENCE?
The part of the VCRA that pertains to Airsoft replicas is essentially a piece of legislation designed to prevent RIFs (realistic imitation firearms) from being purchased by irresponsible people who might use them to intimidate members of the public. A few specific defences and exceptions (valid reasons for purchasing RIFs) were added to the act to prevent legitimate hobbyists like us from being unfairly restricted. This defence was an agreement between the Airsoft community (represented by the Association of British Airsoft, now disbanded) and the government. The arrangement is subject to ongoing monitoring by the Home Office. The Home Secretary is able to withdraw or modify the arrangement without consulting parliament.
https://www.ukapu.org.uk/about/frequently-asked-questions/
I can give info on the UKPSFs later work with the Home Office about MagFed and the VCRA, or also a police commissioners study which felt almost every paintball gun could be a RIF due to non expert opinion under the VCRA, Home Office letter to the UKPSF is on the basis that either VCRA does not apply because of paintball guns being low powered air weapons in the firearms acts and frangibility of Paintball’s or that UKPSF membership could be recognised by the Home Office / courts as a Paintballers skirmisher/approved activities
https://p8ntballer-forums.com/threads/paintball-and-the-law.171875/