Originally Posted by Prospero
Ok, here's my attempt at summarising those domestic booking classes that convert to 'Business UK'
Mainline (incl flights to/from LCY): J, D
BA Connect (excl flights to/from LCY): H, B, Y, J
There may be other eligible codes for BA Connect such as those buckets used to construct a through ticket comprising domestic legs and premium long haul, eg EDI-MAN-JFK.
If Mainline C, I and Y as well. If you book a full Y say EDI-LHR-NCE in Y the whole thing tickets in Y class and the Domestic leg is Business UK - meaning you get lounge access on the Dom leg but not the Europe leg.
Same if you buy a fulll fare WT+, say EDI-LHR-BOS, the Dom leg is in Y class and is Business UK.