Hi all-
Have been looking at a reward upgrade to club multi city and can not find a reason behind the price difference when booking a return and miles to upgrade to one destination and calling up the BA call centre to book as I can not seem to upgrade via the site on a multi city trip. Circa £977 to one destination and circa £1150 via the call centre to return from another airport.

Is this normal as returning from another airport, or am i having to pay a higher charge for calling to book?