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For those not wanting to travel to sunnier climes (i.e. Aix & Lanzarote) for a long distance race in May there's a half ironman event in Choisy au Bac (about an hour's drive North of Paris) organised by the Compiègne Triathlon club.
Excellent value at around €60 -€70.
There's is also a Sprint the day before but no relay.
With a fairly civilised start time of 12h30 the swim is 2000m (1400m with the current and 600m against), a not too difficult bike ride (2 x 45km loop inc a couple of 100m climbs on each one) and a flat looking run alongside the river Aisne.
More details here: