BBR stands for Bankers Buying Rate - it appears because the fare itself was in GBP, but it's a HKG originating itinerary, so the fare construction would be in NUC converted to HKD using the ROE specified, then converted again using a rate that EK gets via a bank.

i.e. 1081.87 NUC * 7.750300 ROE * 0.08877 should be around 745 GBP

As for fare type, looks like a Y Flex, with specific RBD of U class - changes are 1000 HKD, 2000 HKD for cancellation.