I want to stress that the crew member was extremely well meaning. Explained that they were due to be F trained but pandemic happened. Then, during pandemic was forced to work F anyway. Since then, prefers to work short haul so hasn’t wanted to be trained in F.
Separately, they had looked to book a personal flight for their partner on this route and had seen how much the price for F was - and was concerned that they would not deliver to the standard therefore expected for that price.
However well meaning though, there was a clear lack of knowledge of F procedures. Not a problem for me, but it is a bit concerning that BA cannot deliver the right staff to execute its value proposition.