Originally Posted by chewy
HMCG have to tender, thats why most CG vehicles are all different makes and shades of blue/grey!
Actually, (just to be pedantic and add a bit of thread drift) the different makes are part of policy - so that a recall or design fault found in one make won't ground the whole fleet leaving no cover. There's nothing to stop a public body specifying a certain make or model when tendering.
The colour change is due to the same reason as the police changed to silver - silver or grey has a higher residual value than the traditional blue, so the leasing costs are cheaper, plus the yellow bonnet/roof is done as a wrap now not a spray so easier to sell on.