Just wondering what tackle to use. I will be fishing quite a small river and using the obvious maggots as bait.

Don't just stick to maggots they often prefer sweetcorn.
Tackle wise a rod that has a bit of backbone to it, length is a combination of personal preference and the size of the river you plan to fish 13' is usually a good starting point though.
Reel many including myself prefer a centerpin for trotting with though there is nothing to stop you using a fixed spool reel should you wish if you choose a n open face fixed spool reel just ensure that you can comfortably drop your finger on the lip of the spool whilst holding the rod many fixed spool reels are too long in the stem for this to be done comfortably.
Floats Avon style floats are a good starting point
Shotting pattern the simplest and one of the most effective is a simple bulk of shots about 18" above the hook and a no6 or 8 shot a few inches above the hook.
Hooks I prefer Kamsan animals barbless a small selection sizes 12 -18 will suffice.
Landing net essential!
Hope this helps

Thanks!!!!
Will they take small brandling worms?

They love them.

Some great advice above, I'd also recommend you incorporate a tiny matchman's swivel in your set-up, just below the bulk shot and above the hook length. Given the tendency of double maggot bait to spin in the water when you retrieve, and the way grayling gyrate in their fight, the swivel eliminates a twisted main line and makes life much easier.

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"In wine there is wisdom. In beer there is strength. In water there is bacteria." - German proverb
JH based near Southampton

As above. I'd also always go for barbless hooks too. Grayling can be a mother to unhook. Fight just as much out of the water as in it. I often use a disgorger even if the hook is clearly visible (don't go without one anyway and learn how to use it correctly - essential piece of kit) as I find I can usually flick it out easier/quicker. I have bad eyes and fat fingers!

Don't be scared of a decent hook size either. I usually start on a 16 and if I start dropping too many fish I move up to a 14 or even a 12. However, my mate swears by going the other way...so what do I know?

And he is correct

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WHEN YOU LEAVE THE RIVER, TAKE NOTHING, AND LEAVE ONLY FOOTPRINT'S!!!

THA CAN TELL A YORKSHIREMAN ,BUT THA CAN'T TELL HIM MUCH !!

Just to add to above....

...as per Bruce, its small hooks for me with maggot, 18 barbless wide gape generally (or maybe a 16 if chub about) - Kamasan B911 or Drennan wide gape match (same hook basically). I dont bother with a small swivel, never found the need, just more clutter. A wide gape hook accommodates double maggot comfortably without creating a propeller effect (Like a crystal bend hook pattern would)

Agree with using a disgorger. I'm sure grayling casualties are because they wriggle so much that people react by gripping them harder....and squashing them. So use barbless, strike/lift early at any sign of the float holding up (to avoid deep hooking), hold them carefully not too tight when unhooking and with barbless it will flip out easily too. Don't overfeed with maggots or they will lose interest.

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Oh aye, aye and aye again.

I don't use a swivel IMO its just something which is not really necessary a bit over the top.
I go the other way with hooks when using red maggots start with a size 20 and if a few come off the hook go up to a 18,
Its not the hook most of the time which makes the fish come of the hook its the float jumping about on the line above, One of the reasons I think you should use as small a float as you possibly can get away with.
check out these hooks when using red maggots
The red coloured fine wire hooks by drennan are excellent Drennan Red Maggot Barbed Hooks | eBay