This is going back a long way but I think that POT 80 was one of the examples in my "I-Spy" car registrations book and (in the sixties) was credited to a Scottish greengrocer.
This is an interesting area of the map as the square to the South East has a duck and that to the North East has another dancer, though the railway goes through neither.
Your duck has just checked-in at the Holiday Inn on the SW outskirts of Norwich:
This one might be too easy, as the duck has taken up residence near a very appropriately named village:
Time for another clue as you're obviously looking for that Hymek in vain:
Nearby you will find a feature whose name suggests the resting place of 72010
Warnham Mill Pond to the NW of Horsham:
This duck is by a mainline - depending on your age, you might have seen a Hymek on this route but that clue may send you in the wrong direction:
Yes it probably was a bit of a give away - to be honest I was so busy checking that there were no names or road numbers in the square that I missed that clue!
Thanks for the clue - it helped me to realise that I recognise this one; its just to the East of Goole Bridge over the River Ouse. For a bit of extra info, the duck is on Saltmarshe Delph!
This next duck is the last one on this line: