Tornado GR4 HMCS
Kitbag,
I assume that the HMCS UOR in April 2011 was for a limited number of systems sufficient for the in-theatre Tornado GR4 Det that was then delivered in April 2012 - to 617 Sqn at the time.
The tender issued in July 2015 was for rollout, embodiment and through-life support on the entire fleet to the OSD. Although I have no experience of tendering, I would imagine the methodology has something to do with EU competitive tendering rules - see this in my previous link:
"Advertising Regime OJEU: This contract opportunity is published in the Official Journal of the European Union (OJEU)...".