Fished this years ago and moored in Llangollen town for a few days.
Best fishing was further up the canal than the last boat moorings towards the falls that feed the canal. The only craft along this stretch was a horse-drawn narrow boat which went up as far as the winding hole and then came back towards town which necessitated ducking under the tow rope as they came by.
I caught roach, perch and loads of quality dace on bread-punch and hempseed, as they are easy baits to keep on a boat. One day walking in the town I found a tannery (don’t know if it’s still there) and was able to scrape up a few maggots of the hides but I caught smaller fish on these.
Plenty of fish all along to the junction with the Shroppie, I had a good evening session near Wrenbury Mill, but remember that it’s the shallowest and probably busiest cananl in the country so very early starts or last-hour is essential.