Be adaptable Mike use your experience to start with and keep watching the others to give you pointers on what to go for to maximise your catch. Different species always welcome but when there aren't any new ones go for what is about and max out.
Comp I had last Friday in the Solent was like that - not lots of species - only five for me - and only maxed on pout - but had enough of the others to do OK.
First in a comp. for me was to use the 12-30 class rod all day - allowing me to bully the smoothies to the boat in a hurry and still OK for the smaller species.