Actually it looks very like the 1/35 (1971) & 1/25 (1972) Tamiya Cents, but 49 & 50 yrs late respectively (Dates taken off the bottom of each model), but with little to no detail update. Same decals set appears to have been used, I did notice they’ve improved the double tow rope, appears it might be string?
The mantlet cover is an odd way of handling elevation & depression. The open pin design of the tracks is odd too, possibly plastic tracks? The photo of the model being held suggests there is little weight in the model, metal tracks would have made that shot very difficult.
No doubt more will be revealed as time goes by.
Haya UK have been working on a 1/16th Centurion for a little while now - Centurion update - Page 2 - RCU Forums - hopefully this will not throw a spanner into those plans?