Just to bring the list up-to-date:
Agenda London
Amy Howson 1914 J Scarr, Beverley South Ferriby
Beecliffe 1925 Rich. Dunston, Thorne Poplar Dock
Charles William 1924 J. Scarr, Beverley Cowley, GUC
Comrade 1923 Warrens, New Holland South Ferriby
Danum Rich. Dunston, Thorne France
Daybreak 1934 Rich. Dunston, Thorne Thames
Drake Falmouth
Dritan 1950c Hepworth, Paull Brixham?
Elspeth May 1951 Rich. Dunston, Thorne London?
Enterprise 1957 Hepworth, Paull
Ethelwood 1950c Rich. Dunston, Thorne Shoreham?
Ferncliffe 1925 Rich. Dunston, Thorne Medway
Forward 1954 John Harker's Poplar Dock
Guidance 1905 Stainforth Shoreham (wood construction)
Harlequin
Heritage 1957/8 Waddingtons Swinton?
Hope 1908 J Scarr, Beverley River Thames
Kama 1903 Gainsborough Germany
Lys 1937 Henry Scarr Ltd Belgium/Netherlands
Mimo Belgium
Nidd 1937 Henry Scarr Ltd Belgium
Onesimus 1913 Joseph Scarr, Bev. Keadby
Orotan (James & Mary)1950c Hepworth, Paull Ireland
Pioneer 1910 Gainsborough Stainforth
Reliance Thames?
Riccall France
Richard
Sara
Sectan 1950c Hepworth, Paull Beverley
Sequana
Service 1951 Hepworth, Paull
Sheaf Wakefield
Shirecliffe 1923 London
Sobriety 1911 Joseph Scarr, Beverley Goole
Southcliffe 1923 Rich. Dunston, Thorne Goole
Spider T 1926 Warrens, New Holland Keadby
Swift 1894 Joseph Scarr, Beverley Wakefield
Syntan 1949 Hepworth, Paull Beverley
Thomas H 1940 Rich. Dunston, Thorne Staines
Victory Harkers Rotherham
Valiant 1959 Hepworth, Paull Rotherham
Wey 1937 Henry Scarr (Dunstons) Nottingham
Non-Sheffield-sized boats
(Hunt's) Eden 1924 Henry Scarr Ltd Goole
Egret 1905 Joseph Scarr Castleford?
Hiddekel Goole
Hunt's Kim 1923 Henry Scarr Ltd S&KC
John M Rishworth 1915 Henry Scarr Ltd Milldock, London
Misterton 1923 J Scarr, Beverley Staines (Lincoln sized boat)
Phyllis 1907 W H Warren South Ferriby
Taurus Swinton
Vivos Swinton
Billy boys
Brillant Star
Saira 1899 Hunt & Fowler, Hull Wakefield