Re: If only..
You mean there might now be smuggling across the Irish border - surely not ?
Ah, but the good old days smuggling occurred before there was a single market, and we had silly subsidies for exporting butter to another EU country. What was interesting ( a few years ago now) was to see how many petrol stations there were within about 20 miles of the border on the North (roughly zero) because fuel duty was massively lower in the south.
They'll need a Trump wall sadly.