You must start your itinerary in BCN or all flights will be cancelled.
what OP2002 said, the reason BA have a good deal is to encourage people taking such a roundabout route instead of a direct flight, since why wouldnt you fly direct if it was cheaper *and* quicker?
If you could do what you suggested, no one would buy the more expensive direct ticket from London so BA and all other airlines operate in the same way, cancelling flights if you miss one leg,to avoid customers gaming the system in this way.
I would add that if you do decide to buy then make sure you have enough time between the flights (around 5 hours) as flying into LHR, out of LGW means you are responsible for getting yourself and any luggage across London at your own expense.
Airport changes such as this are best avoided if possible.
It may not be so much of a problem on the return leg as assume you will pick up your luggage at LGW so there will be no imperative to take LHR-BCN flight leg, BA may not like it but what can they really do about it? just don't make a habit of it
If you void a LHR-BCN part, your ticket will be cancelled. It is best avoid doing this or lose money.
Nomadroaming-LHR-BCN is the last leg of the return journey so if he misses it and the ticket is voided what has he lost? OP is based in London
Now I see what is about. But I still should say it is better not abuse the system.
As mentioned earlier, the reason BCN-LON-MRU is cheaper than just LON-MRU is because it's competing for indirect services with other carriers.
Instead of trying to game the system, have you looked at indirect (one stops) on other airlines out of London connecting at other cities? There may be airlines competing against the LGW-MRU non-stop and offering price breaks for the "inconvenience". Then, no need to do a positioning flight to BCN just to come back the way you came on the first leg.
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