So they are 32A blue 60309 connectors, 3 pin presumably?
Looking something like this: http://www.comms-direct.com/images/big/P-32EXT6B1_2.jpg ?
They would need inspecting & testing, and you would test them in the same way as any other 230V extension lead.
You can make up your own test adapters (13A plug > 32A socket, and 32A plug > IEC socket). The 32A connectors are readily available from electrical wholesalers, or places like RS components, CPC etc.
C&G 2377 -01 & -02