Firstly Thanks for the reply.
From reading the posts it seems that the only way to get the N1 to spool up to the correct figure is to accept a increase in speed, which is what we expected.
Question 1: If we happen to be in a situation with flaps 4 and Vapp +10kts and the N1 value is still below the acceptable value is there anything that can be done to save the approach?
Question 2: Not considering stable approach criteria for this case, Will the extra 10kts be enough to compensate for the inital slowed response of the engines in a go-around due to the lower N1 Value?
Cheers Tommy