"Isca" is the main clue here. It was
the roman name for Exeter. "Enabes"
is Steve's name backwards. Michael rows the boat
ashore and Pip was my childhood nickname - just
names for the boats as is Primrose. The train
4589 was shedded at Exeter. The daffodils refer
to one of Exeter's main stations - St David's
(patron saint with the flower of Wales) and the
telegraph pole is for Telegraph Hill, a well known
traffic hazard nearby. The anchor points us to
Exeter's Maritime Museum and the avocets can be
seen at certain times of the year on the Exe Estuary.
The chess bishop and bishop's crook illustrate
a reference in the text to the Bishop's Throne
in the Cathedral and the dovecote facing north
to Northcote, a theatre in Exeter.
Again there are two roman numerals here - VII
and IX (7 and 9). The only reference to time here
is how much time costs - 10/6 per hour. The tenth
and sixth words in the text are "this"
and "station" which go into positions
7 and 9 in the "key" message