Please take the following list as constructive criticism :)
- The vehicle you've attempted to replicate has an incorrect specification of lightbar. It is supposed to have a Premier Hazard Sovereign with a spacer in the middle yet it's far from that..
- Armed Response Vehicles used by the Metropolitan Police are equipped with beacons for airport use. This vehicle seems to be lacking one.
- You have for some unknown reason mounted Whelen TIR3 modules on the bumper when infact Whelen ION modules are being used..
- Inside of the grille two Whelen ION modules are mounted 'clipping' inside one another for another unknown reason..? They are fitted with Whelen M4 Modules.
- The vehicle livery seems to have been completed 'half-heartedly'. Some edges have been rounded off (smoothed), compared to others which haven't been touched.
- The BMW X5 F15 has the incorrect trim around the tires, it sticks out, where infact it should be smooth.
- The headlights on the model are incorrect and do not portray proper specification as to what the MPS use.
- The mounts on the lightbar are 'clipping' rather severely with the lightbar not being mounted correctly.
- The roof stickers are too large and lack a black outline.
- The size of the ANPR camera is too small in comparison to IRL images of this vehicle.
- The tetra dome is to be mounted with the vehicle yet lacks rotation (this is a pointer for other equipment used on any other vehicle and isn't that much of an 'issue'.)
- All of the weapons inside of the gunlocker are a dark shade of black which doesn't resemble what a firearm looks like.
- The decals on the rear windscreen are too thick and reference images would assist in doing a better job at replicating how they're meant to look.

I don't quite understand why you've released an MPS ARV X5 F15 when there's one released already which is a lower polygon count as well as being accurate.

I do hope you take my pointers on-board and I'd be more than happy to amend my rating on this release if you improve the vehicle.