its above chippenham section i got a ticket for .
unless i got have a few days on the wye which just over a hour drive
I have only fished the Bristol Avon a couple of times so cannot help you much but my feeling is, give it a go. There are no absolute rules in fishing, advice or not. Chub feed all year round and there may be a general better time/season for them but if the conditions come right for them to be feeding on any given day; who's to say you wont catch..This might help with sorting out good days when conditions are good for chub once the season starts
https://fishingweathergb.yolasite.com/
A square inch of cheddar cheese is always a good bait for chub and barbel like it as well . I would be tempted to try roving tactics with it myself, you will get to explore the stretch and if there's chub in there it will give you a good chance of winkling out one or two. Cast under trees, along side bushes, sunken logs etc or a few likely looking glides and move along after 15 minutes or so.
I liked to free-line a lump of cheese, it has weight for casting well with a good loaded spool but a float just as good or a link leger maybe. Undercuts or little side eddies often worth a try, chub like to sit in these out of the flow sometimes.. Alternatively try a big lump of bread flake, chub always a goer for it and you might just pick up a big roach as a bonus. Chuck in a couple of small handfuls of mashed up bread to awaken interest and give it 15 mins or so and keep trying different swims. Nice way to fish on a summer day, you do not have to lug around tons of gear, keep it light.