Sonic bum, Thanks for the additional information. Your trainers manual is ahead of ours and would offer the protection I seek if the worst came to the worst. Ours specifies the trainer only makes the stop go decision and LHS commander PICUS actions the RTO.
unfortunately we do have two Captains flying together most months (normally the senior Captain in LHS) but if it were a trainer in the RHS he cannot command the reject unless LHS becomes incapacitated (as we both described earlier).
Great discussion , clearly, what is most important Is that everyone in a company is clear on who does what.