Seems like UK can ignore bombing and not launch interceptors.
If I was going to bomb UK, I would just rather conduct air attacks on London land and air units, thereby actually killing units and forcing at least a small buy there as Germany starts the game with 1 transport.
Each bomber or fighter kills 3 IPC’s when it kills an infantry, or 10 IPC’s when it kills a fighter. On G1 you can kill 3 fighters and 2 infantry for a cost of 3-4 air units. The UK fleet is meaningless without land units to take German soil. If you build a tac bomber and fighter (1 IPC cheaper) a turn, you will still clear 9 infantry (27 IPCs) for like 5 air units (unless you can build enough air to end it one round in which your losses would be 3 units-30 IPCs). I would rather throw air units away killing units then damaging a facility that may not be repaired.
I’m not saying I would do any of this, but this is the technique I would prefer over bombing.