Light Switch installation problems

Oh FFS: He/She/They were sold a 2 pole switch instead of a 2 way. I read this this morning but was afraid BAS or winston would reply.
 
In all the places with metal switches there's an earth wire that just needs extending so that shouldn't be a problem but I sent someone to the shop to get the earth wire and they explained to the guy in the hardware shop that we needed earth wire for light switches and they gave him stranded wire so should the work even though the wire that needs extending is solid core?
 
and they gave him stranded wire so should the work even though the wire that needs extending is solid core?

Extending the solid core with stranded care can only provide and effective Earth if the far end of the solid core is securely connected to the Earth in the consumer unit,
 
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