Kent Police have recently entered a seven force collaberation with Essex, Cambs, Beds, Herts, Norfolk and Suffolk with relation to firearms policing.
Part of this collaberation is enhanced buying power when it comes to getting kit and will over time improve interoperability between the forces.
Recently Airsoft style face masks have been issued for operation and training use as a covering for the face when there is a liklihood that 9 - Bangs are going to be used of any MOE equipment.
Likewise some of the forces have started using Airsoft RIFs in force on force training scenarios for a number of reasons, mainly cost. A BB costs a lot less than a 5.56 simunition paint round.
You can also use BBs in most training venues if you dont mind running a hoover round afterwards, whereas its much more difficult to scrub the walls of paint of the school youve been using for 3 weeks as a training venue whilst the kids are off.