The Why at Ross is excellent mate, and the average Barbel size is 6lb+. Fish in the town centre and I think it's still about £5 a day ticket. (Ross AC iirc) There are 2-3 pegs directly behind the hope & Anchor pub free of charge, and I've caught barbel 10lb+ on this stretch of river.
The Wye isn't too popular nowadays due to the ease of catching 100lb catches on nearby commercial waters. Those places aren't for me but each to their own.
Look for the pegs that have had recently been fished, and also read the features in the river. A spade and saw helps to cut out a peg that is overgrown. This is allowed as long as you don't sabotage the bank and foliage.
There are some huge chub in the river, but in my experience fishing on there, they are wary of hair rigged halibut pellets. Luncheon meat with buried hook is the best approach for the big wily specimens in there, some go 8lb plus I'm told, but I've not caught many as I target the Barbel on open end pellet feeder plugged with a fishmeal groundbait. Tackle I use is either a 1 .75- 2lb TC rod. Reels I use are Shimano 6000's loaded with 13lb Fox camo soft steel mono. Sometimes straight through to hook is ok, otherwise when fish are finicky I use 10lb flouro carbon hook link. Hooks depend on how confident fish are feeding. I usually start with a 2.5 to 3 ft hooklenth, this IMO is the optimum length with normal river flow.
There are also a few lean hard fighting carp to be caught. My mate had a brace of 14 and 16lb, although I haven't landed one so far.
The white house B&B is good(100m walk to bank), reasonably priced and hearty breakfasts too.
Hope this helps. Good luck and tight lines.
I was fishing the Wye the day ADUG bought us out. Listening to talk shite on my radio. Gob smacked was not the word, especially when we signed Robinho from the clutches of Chelsea; )