[QUOTE=Pure Pursuit;9975492]RAAF E-7s are indeed 737-700 however, any RAF purchase would involve 737-800 airframes.
I am not sure if you understand the differences between the 737-800 and 737-700? The Boeing offerings for both AEW&C and JSTARS are based upon the 737-700. The P-8 is a 737-800 (which is significantly longer) as it has the weapons bay on the aircraft. The P-8 and E-7 have 900 and 800 wings respectively. I am not sure why either Boeing or the MoD would want to re-design the E-7 to sit on a different/larger airframe? If the MoD want to procure off-the-shelf, as a low risk option, then I would suggest they are going to buy more of the same rather than fund any additional work.