Punto 1.2 16V - Spark Plug Tool

Has anyone changed the spark plugs on a Punto Sporting (2001 Mk 2) and, if so, what tool did you use?
I have a Draper 1/2" drive socket for 12mm plugs but the socket is too
wide to go down the hole to reach the plugs. Any advice on what tool to buy would be appreciated.
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