From here it should be easy to reach Somerset - follow the stream to the River Sherbourne, then downstream underneath Coventry city centre, join the River Sowe at Baginton (Coventry Airport) and down to Stoneleigh to join the Avon. The Avon passes between Warwick and Leamington Spa, through Stratford and later Evesham before joining the Severn at Tewkesbury. Just a short trip to the west of the Cotswolds and past Gloucester, under the Severn Bridge and the fish will be in tidal waters in the Severn estuary. If he stays at the English coast he'll be home once he's past Avonmouth near Bristol. However, there's no telling where tides and currents will take him. Swim, fish, swim!