BA's withdrawal of the Cork - London routes (specifically LHR) was in part down to their battle at the time with VIRGIN on the transatlantic routes, as part of their 'Dirty Tricks' campaign. To free up more slots in LHR, they simply pulled their ROI services thus ensuring they could get more aircraft in and out of Heathrow to compete with VIRGIN. Subsequent BA ROI services were provided by City Flyer out of LGW and LCY.
Fruitnfibre; I remember when BA closed the Dublin Heathrow route on Mar 24th 1991, (Cork went that month, and Shannon route had closed early Feb mid season schedule). BA said at this time that they were using these slots on LHR to German destinations plus I think Copenhagen saw an increase in frequency too. I dont that there was any connection with the Virgin situation at that time. DUB LHR was losing money as BD was on the route since 1988 and were increasing market share, and EI was losing a fortune
EI-BUD