Sometimes as shown in this example, we struggle to provide a vehicle that is like for like and the only stock available may be more prestigeous vehicles but we never supply something less without consent from the customer e.g. downgrade.
If we do supply the customer with a more prestigeous vehicle we still charge the third party insurers at the same daily rate of the 'aimed' vehicle group, e.g. client needs an S2 group, can only supply an S3 vehicle but would charge at S2 rate.