Firstly, I wish you good luck Graham.
Zander can be the most infuriating species there is at times (just look what they've done to Skip!) and add "river" into the equation and you can just about double that statement up.
Just my experience but if you're gonna use a live then go for a perch, zander and bigger perch just love 'em and they will outlast a roach four fold.
If I were fishing two rods I would have a live on a float paternoster rig and watch it like a hawk, along with an inch square of a freshly caught and killed bait fish on an alarm on the other rod.
I like to use floats but you'll know the tweaks if you want to do otherwise.
Forget the rule book too.
You can catch in the brightest sunshine at midday but one thing you will probably encounter is that the damned things like to swim around for ages with the bait in their mouths and circle hooks are well worth a go as you can forget about the safety aspect of instant striking, but don't strike with the circles just gently wind into the fish and build up the resistance until the hook pulls clear of the throat and turns into the scissors on the way out.
And those likely looking slacks can be a bit misleading too, zander like to feel the flow over their backs so somewhere with flow and cover or the edge of a crease is perfect.
Coloured water I have found to be best and the heavier the better.
This was the first session I ever had with circle hooks, I banked a zander but didn't get a shot of where the circle hook lodged but I did manage it with a small jack during the same session...
I've also had two zander off my local river in the last three weeks on perch livebaits but I daren't tell you how many I think I missed or which dropped off
mg:
Finally, when they've wound you up to fever pitch and you have given up, you will go on a pike session and land five of 'em on far heavier and maybe even cruder gear as I did!
It's the nature of the beast I'm afraid.
Again I wish you good luck, I hope something there was useful and please let us know how it goes