At LHR our PA is as follows: “Larger items, including laptops, must be switched off and stowed away safely”. The ambiguity lies in where is considered “stowed away safely”, and similar to other posters, I believe having a laptop at the row 1 bulkhead, or indeed at any row, would not be wise. I do believe the seat pockets at the bulkhead contain a weight restriction placard, which you may well be exceeding with your laptop added to all the BA literature already in place