A center cockpit/aft cabin version (AC-20) was introduced in 1975 (approx. 150 built). Still another version, the S-20, introduced in 1976 has a smaller cockpit and larger coach roof and no inboard motor.(approx. 150 built).

AC=Aft Cabin.
Center cockpit/aft cabin version of the MS-20.

AKA: VX ONE-DESIGN
Ross Weene was the design engineer.
The original builder was Bennett Yachting. By 2013 US based Bennett Yachting announced that it had teamed up with Ovington Boats (UK) and MacKay Boats (New Zealand) to establish international VX ONE builders on three continents.
Ballast: Per class rule E.4.2 – Keel assembly comprising bulb, fin, top plate and the bolts to fix the top plate to the fin. – Min 60 kg / 132.3 lbs; Max 76 kg / 167.55 lbs
SA Gennaker = 390 sq ft./36 sq m.

One of the earliest FRP dinghies built in GB.

Fin keel version – draft: 2.2m / 7.22′

Spin. Area: 10m2/107’2

Spin. 18m²/194sf
1 Trapeze permitted.

2 man, trapeze (1) dinghy with sym. spinnaker. Intended as low cost trainer and similar to the 420.
Relatively rare even in France.