jim bob
I wonder, which map the question originator is looking at? On Ordnance Survey maps symbol guides, there is no RED STAR. There is however a blue star meaning: Other Tourist Feature.
Alley
a
Ch means church.
There are many places where one can find an ordnance survey map. One looking to find an ordnance survey map should visit the official Ordnance Survey website and click the 'Get a Map' link.
Red . On all the many OS maps that I have, motorways are blue.
It means a "Public House"
It refers to a Pump or Pump house
The path indicated by long green dashes on an ordnance map refers to a walking path that is a public right of way.
FC relates to 'Forestry Commission' therefore a green shape with the letters 'FC' on an ordnance survey map means 'Forest or woodland'.
A point where water issues from the ground, eg. a spring.
Ordnance Survey