In the spirit of Christmas, Prof and Jakswan, could you please stop this tedious process? Neither of you will convince the other.
Although my own sympathies lie with ProfessorDavey I fear that this discussion has reached the level of two entomologists arguing about the number of toenails on a millipede - where each has chosen a different species for reference. I mean no discourtesy to either of you, but the discussion seems to be going nowhere.
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One aspect of Brexit which no-one appears to have considered is that - since the days of Thatcher - "Britain" has been up for sale. The influx of currencies from ... wherever ... appears to be paramount. Any bid from abroad for a UK owed business seems to be permissable. Apart from one or two niche manufacturers like Morgan, there is no British-owned motor vehicle manufacturer. The most overtly British brand - Jaguar Land Rover - is Indian-owned. Mini and Rolls-Royce are owned by BMW and Bentley by VAG.
Other brands are part of larger manufacturing networks. Nissan may have one of the most efficient manufacturing plants in the world, at Washington, but it is controlled by Renault. Vauxhall has moved ownership from General Motors to Peugeot.
In other industries, Cadburys is buried inside Mondelez International (the result of a restructuring of Kraft) - an American company. Mondelez also owns Terrys of York, but manufactures in Poland.
Heathrow Airport and O2 are owned by Spanish interests. The list goes on ...
All this may be fine at the moment, but ignores the fact that strategy is determined elsewhere. There can be little doubt that should Brexit become at all troublesome then overseas corporations will look after their own immediate interests and simplify their operations by removing UK operations, suppliers and supply chains from their businesses.
I suppose that one bright hope, however, is that following Brexit, the value of the pound might drop so much that manufacturing in England (Scotland will be independent by now) will become so cheap that England will become the Bangladesh of the western world. Something to look forward to ...