The flights worked out OK and we had resonable seats. The BA T5 South Lounge was good and both flights on time. On the return, the Saga lounge in KEF that (I think) most C class pax go, was one of the all time best I have ever been in. Space, comfortable, food and drink all good.
Overall, KEF is good, much expansion going on as their tourism continues to expand.
I won't bore you with the numerous glitches in the IT systems of BA. Sometimes, on their App - they cannot even log you in ...