Laurence Lock is the founder and director of XS RIBs (and Barnet Marine). XS was designed to fill the capacity that Tornado could not fill, but as events transpired (Tornado's move to production in China) XS have to all intents and purposes replaced Tornado in the UK. The new XS750/850/990 have taken the XS product to even higher levels, certainly equalling if not surpassing Tornado build quality.
The hulls are produced in Hull (naturally), although the actual manufacturer remains a big secret. They are outfitted (motors, electrics, stainless steel etc) by Barnet Marine in north London.
As an owner of two previous Tornados (a 7.5 outboard and an 8.5 Diesel) I'm very impressed with the XS product - so impressed that I have an XS850 with twin 200 Verados on order!
The downside to the success of the XS brand and the enhanced quality has been a hike in the price, but I guess that's market forces for you.