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THE following puzzle was sent in by a young schoolboy:

‘Five businessmen (Adam, Brian, Clive, David and Edward) all live in
Glasgow. On their way to work they all approach the same roundabout from
the same direction and each takes a different one of the five possible other
exits from the roundabout (labelled A, B, C, D, E in clockwise order from
their entry).

‘The exits lead to Aberdeen, Berwick, Carlisle, Dundee and Edinburgh.
In each case the letter of the exit, the initial of the man using that exit,
and the initial letter of the destination are all different.

‘David leaves at an exit labelled with a vowel, Adam leaves the roundabout
at the exit before Edward, and the man going to Edinburgh drives past Clive’s
exit and leaves three exits later.

‘What is the label on the Aberdeen exit? ‘Who takes the Dundee exit?’

Unfortunately, this brave attempt does not have a unique answer so I
told the young man to resubmit it with an extra clue of the type ‘Exit .
. . does not lead to . . .’ He did this and it did then make an acceptable
Enigma.

What was the additional clue?

A Pounds sterling 10 book token will be awarded to the sender of the
first correct solution opened on Thursday 14 December. Please send entries
to Enigma 541, New Å®ÉúСÊÓƵ, King’s Reach Tower, Stamford Street, London
SE1 9LS. The Editor’s decision is final.

The winner of Enigma 538, ‘Rule of the road’, was Ronnie Murphy, of
Manchester.

Answer to Enigma 538 Rule of the road D, C, A, B, E.