Completed Central Brum to W21 via New Main Line recently then reverse via Black Country Museum and Old Main last week. ( as per @davem399). in both cases Gas Street to Smethwick was good, New Main to Factory was full of algae, not too bad on rubbish but uninspiring from a boating perspective. Saw no boats, either moving or moored the whole way and moored overnight on the Gower Branch by the Temple. Local yofs driving their mopeds and trail bikes along the towpath….
Tipton to W21 was full of weed, however in both cases didn’t have to go down the hatch. On return again no real probs with the W21 to Tipton section, water very clear in place’s especially around the Fountain. Old Main line had several problems with sacks and clothes around the prob which involved a couple of visits down the hatch including 30mins drifting under the M5 trying to sort it. On reflection preferred the old main line, more interesting from a boating perspective though shame that some of the locals treated it like a dumping ground…..