water leak in driver's footwell - cliff

I know leaks can be notoriously difficult to find.

I'm getting loads of water in the driver's footwell, I've run a hosepipe around the door seal and left tissues all around the door rubber overnight in the very heavy rain but they all stayed dry.

I'm not losing water from the engine so it isn't the heater pipes.

I've left tissues above the pedals which have stayed dry.

Has anyone experience of a leak in these cars?