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The easier way to describe what you have running from the socket to the switch is a 'switch line' the connections in the ceiling are the 'lighting loop'. Your switch has no neutral because the switch only need to connect and break the live (or 'line') for it to turn the light on and off.
It's a common problem to encounter when fitting exterior lights. I've been thinking a more modern solution than pulling a cable would be to use the switch line as a normal cable and switch the light by using a wifi switch. This would give you power at the switch to run to an exterior light. Might be tricky to get the combination of exterior light switch and wifi sender on the same switch plate but it seems like it should work in principal.
When I've had to fix the problem I've dealt with all the decorating etc. It's usually worse thinking about it than doing it. In fact it's easier if it's recent because the paint won't be faded.
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Airhead
Disclaimer: I have no idea about electrics so might not use correct terminology.
Anyone got experience of fishing a cable from a light fitting to a switch (light on ceiling obvs and switch on wall, wall has cavity insulation). Our electrician is saying we don't have a neutral feed to enable an external security light to be hooked up. It used to work but with an extension being built someone has fucked around with electrics and it means we need to get a neutral feed.
The cable is obviously running from the light in the ceiling to the socket so it could be pulled through but I am sure there must be a better way to do this. Any ideas?