I'm not an expert on catching Tench or anything else for that matter. I'd suggest you do a SEARCH (in the menu on the top right-hand side) and see waht you can find. I'd limit the search to the Species Specific Forum to start. TIP - Tick the Archived Posts box to search everything that's ever been in the Forum.
This time of year, or any other for that matter I would fish a cagefeeder with brown crumb, dont bother with sensas stuff ive found it hasnt made much difference, sml amount of sweetcorn and somre kind of pellet, caster, maybe chopped worm mixed in. A 2ft hooklink in winter so you can feel shy bites and maggot or caster or sweetcorn or lob/redworm on the hook. Keep changing baits to see which ones produce bites. If there are lilies where you fish get your feeder right in close to them.
Get them rods bent, get them reels screamin', get fishin!
on the pole with worm on the hook over chopped worm & caster normally fish between 2 & 6" overdepth hooksize dependent on bait size.
if you do a search youll find ive had some good nets of tench in winter inc 19 for 69lb, 11 for 47lb,
Forgot to mention every 2-3 mins slowly drag float about 4-6" sideways this causes the bait to just flutter on bottom & very often can result in a bite
NOTE if your using lobworm on hook when float does sail away count to 3 -5 before you strike.