I have a really easy one..not strictly batter though!!
It can be done in advance too then grilled!
Dip your fish in flour(seasoned) then egg and deep fry in hot oil!
lay on kitchen paper to take of oil...the fish not you!! then grill when you want to eat it or you can eat it straight away!!! with salad and new potatoes and mayonaise,yum! and I dont like fish!!!!!