I have this bike
Will these mudguards fit OK?
I don't know much about fittings, but there is a picture on the bike link.
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From the Topeak website, the front one attaches like this:
and the rear one like this (onto the seatpost):
so it's likely they'll both fit.
A search for the Topeak FX Mudguard on Google Shopping gives me various ones at less than £9 as does the Topeak RX Mudguard. This place allterraincycles.co.uk appears to have both the front and rear in stock and will charge you 2 quid less including delivery, than the ebay one you're looking at.