Handtec were the cheapest by quite some margin for a Garmin GSC-10 cadence and speed sensor add-on for the Edge range. Despite seeing the negative reviews on here (there's another site with much more positive outlook) I went ahead with the order at about 3pm.
The item turned up the very next day via 1st class recorded post (for 99p delivery). It's the latest version of the GSC-10 and is brand new.
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