MADY
I think the story was this - mid April was the time. One of the two 105s with EAAA was needed at Filton as a maintenance spare while their G-NDAA was at Staverton. Contract presumably allows a type-for-type fill-in only.
Thus EAAA were one down and EC135 G-SPHU was the only spare aircraft Bond had to use for fill-in, as the EAAA agreement was very temporary and they could basically fill in with whatever they wanted. The fact that it would show EAAA what an EC135 was like won't be missed on you or others
but it was not permanently available as it's the fill-in for EC135 contracts
The "new" G-CGXK photo'd above is much longer-term as Bond have leased it in from ADAC in Germany. It's actually an old T1 and the 44th off the line, which recently passed the 1000 mark. Hence all the patchy yellow where those big ADAC titles have been covered over, etc