I'm a coarse fisherman as well as fly so do my fair share of trotting, although not for trout. You can't really use your fly gear I'm afraid as its a completely different method and casting a fly line is completely different too. If you still wanted to use your fly gear you could fish nymphs under and indicator/large dry fly set up to present the fly in similar way to when trotting - that could well be worth a go - "duo method" if you do a search on this forum there's plenty of advice and even some video clips from Paul G.
However, if you want to try bait and float fishing then you'll need a float rod and fixed spool or centrepin reel (fixed spool for starters, also cheaper and easier to learn with). You could use a spinning rod but they're usually too short - you want something 13', 12 would be ok seeing as its a small river. Avon float is a bit chunky and only needed if water is quite fasty an turbulent, otherwise stick float or small chubber type, or small balsa as water is shallow - not much shot needed 3 or 4 no.4 in bulked together for that depth, so a float to match, attached top and bottom by float rubbers, hooks size say 16 for maggots, bigger for worm. Maggots easier as you can loose feed them too - and that is really the advantage with trotting, that you can feed the fish and get them to feed at a time when they wouldn't normally feed. Set float depth to a bit overdepth, if you catch bottom shallow up a bit, if you get nothing vary depth until you start getting bites - although in shallow water like that its less of an issue. Trot the float down the river to them, letting line come off the spool with bail arm open allowing float a free run down, stop line with finger when float dips under and strike, reel back, which re-engages bail arm. You'll see why you can't do that with a fly reel. Chose line which naturally floats - Drennan Float Fish is as good as any and cheap. Take a discorger and fish barbless as trout can swallow maggots if they're in greedy mode.
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