Anybody is allowed to change their mind, but WMID has said that they intend to fly both aircraft for the forseeable future. They are coy about whether this is forever or just until the market on the MD recovers a bit and gives them a decent price. WMID would not fit the timescale that both Yorkshire and Kent/Sussex appear to be talking up. With UK air ambulances falling over themselves for the 902 that recovery may be soonish in UK terms!
AVAILABILITY
There is/was an ex-German 900/902 at PAS that they have had for a while and allegedly a few lying unused in the Far East that may fit the bill. Whether that one at PAS is a flyer or not I do not know. Suffolk County Police in the US had a couple of EMS role equipped machines on offer... and I hear that the KLPD has a hostage 900 in their hangar in Holland!
Whatever the final result both Kent and Yorkshire each seem to have their eyes on something substantive so I guess they are sure will come into the UK within weeks.