the preferred bidder has informed the Ministry of Defence (MoD) it has become aware of a possible issue in connection with its bid
I imagine the cancellation of Nimrod MRA4 and the resultant cut in SAR capability and facilities, which the SAR-H negotiations would regard as "Government Furnished Services" and a given, may be a "possible issue" that would affect the bid. Perhaps SAR-H will be renamed SAR-H/FW and take another decade to negotiate.