Originally Posted by Fossiebear

I have booked a DONE4 ex Cairo as follows:
CAI-CMN-JFK-LAX//LAX-MEL//MEL-KUL//KUL-LHR//LHR-MAD-CAI
As far as I understand i can make changes subject to surcharges and taxes after the first leg is flown.
Correct
I am thinking of extending my stay in LHR until the start of my BA TP collection year with a view to earning some TPs for the new year. Can i please confirm:
1. Maximum number of flights in Europe/Middle East (inc Cairo) is 4?
Correct
2. I am restricted to one further stopover?
Correct - assuming your '//' symbol means a stopover and its absence means a transit (and therefore you are transiting CMN at the beginning)
Can I choose whatever flights i like eg LHR-HEL, HEL-AGP, AGP-HEL, HEL-DOH, assuming i dont stay in HEL or AGP more than 24 hours?
You could stay in either HEL or AGP for more than 24hrs (thus being your second stopover) - but see below regarding allowed flight segments in the continent
I presume i could backtrack between Europe and Middle East as well eg LHR-DOH, DOH-HEL, HEL-DXB, DOH-CAI?
Correct. Note there is no need to return to CAI at the end, DOH and DXB are in the Middle East so you can terminate there. See also below regarding allowed flight segments in the continent

At the start you have one flight segment in the continent (CAI-CMN), so you have three left and must finish in the Middle East.
Also, surface segments are allowed.
thanks in advance