"Piccadilly Pilot" wrote in message
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But why does one road or the other have to have priority?

IIRC, the Warboys Report concluded that it was a good idea.

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A number of people have referred to the "give way to the right" method
that
is in force in parts of Europe, Isn't it about time we had a similar "give
way to the left" rule in the UK?

Even in France, the bastion of priority from the right, it is now so little
used that you will usually find a warning sign at those junctions where it
still applies. In villages, the same effect is usually achieved by putting a
stop line across the main road where a side road joins from the right.

Colin Bignell