Richard Payne's 'Stuck on the Drawing Board' reproduces a Vickers design progression diagram on p.51 showing planform drawings of; Jet Viscount (4x Nene), Vanguard fuselage with Valiant wings (3x Avon), Vanguard with swept wings (4x B.E.47S in underwing pods), Vanguard with Scimitar wing form (including dog-tooth) (3x Avon), October 1956 Vanjet (3x Conway) and the VC.10 as finally envisioned.
The Valiant wing equates to the Mk I, the Oct 56 design to the Mk IV but the other planforms don't fit into that list quite so easily.
The Putnam Vickers book has details of the Vanjet VC10 Mk III. The text identifies three GA drawings, two entitled Medium Range Jet transport and one Vanjet Mk III Scheme 4, all being undated. Data is given for Schemes I-III, the I have 16 cabin windows, II 22 and III back to 16 windows with a shorter fuselage. Schemes I & II were 110ft long, III 98.5ft, span varied; 101.5ft (I), 113.5ft (II), 93.5ft (III). Payload for I & II was 17,000lbs and 14,000lbs for III. All had three RA.29 Avons.