Triathlon things to do near Rayleigh, Essex?

Hi all,

I may be driving there and back once a month for some time, is there anything triathlon to do around there? Running, cycling, swimming?

It seems to be not far from Canvey Island and Southend on Sea which I know nothing about, but recognise the names…

They’re both shit holes

But Hadleigh Downs has some trails to run on

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