That was to keep water from draining from the rain gutter on to the fan motor. The US club, Lotus Ltd., used to sell them back in the day. I suppose they or something similar was sold in the UK also.
Thanks for the explanation.
All that extra weight. Add the weight of the water in the front by where the spare wheel has been taken out, and the power:weight ratio has been ruined.
All these extra things to stop water getting in the bonnet lock hole, or dripping on to the radiator fan, when the windscreen and the doors leak like a sieve.
Plus water get on the the cylinder head where the front two plugs are, and the casting between 2 & 3 is not drilled to drain to the rear, like it is open at the back behind #4 plug.