Hi all, I hope this isn't a really daft question. I'm heading to Helsinki with two of my friends later in the year. One business class ticket is £210 return, whereas buying three works out at £240 return each (£720 in total to save you the arithmetic).

It appears there are only two of the cheaper tickets left. Is it the case that:

(a) the first two tickets are priced at £210, and the next at £300 (total £720), with the cheaper tickets booking into one fare class and the more expensive ticket booking into a higher fare class, or
(b) do all three tickets book into a higher fare bucket and cost £240 each?

I suspect it's (a) but am not sure if you can have mixed fare buckets in one booking. If it's (b) then it seems I can get the tickets cheaper by buying the first two separately, then the third, and TCPing.

Many thanks and apologies if this has been covered before - was hard to know what to Google!