Sir, – I welcome Marc Sweeney's proposals to construct undersea tunnels to develop more energy-efficient rail transport links with our neighbours (Letters, December 31st).
However, the utility of such a tunnel may be diminished by the imminent departure of the UK from the EU, which may in turn cause a risk of shortages of goods coming into Ireland as they become subject to customs checks and regulatory barriers while crossing our nearest neighbour.
Instead of a tunnel to Britain, might one to Brittany be more appropriate? – Yours, etc,
CHRISTOPHER
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McMAHON,
Castleknock,
Dublin 15.