Originally Posted by
williamd
It's a family holiday, so unfortunately I can't do that routing
As long as I get at least 320 tier points (r/t) on the route(s) I've looked at then I'm happy enough as I should be able to achieve silver later in the year with another trip.
You will get rather more than that this time. There is a calculator on BA.com under the Collecting Avios section, just enter it in flight by flight, selecting the airline as appropriate, and adding it up as you go along. By all means revert if you can't get it to work for you.