Unfortunately the Silver Jubilee Set is different to the Coronation set. The Coronation set is 2 articulated coaches, that is the 2 coaches share a bogie. The Silver Jubilee Set is made up 2 x 2 articulated coaches and a triplet set, then a coach was added to the rear pair to make another triplet set. Then they were slightly different. So new tooling would be needed. But not impossible as the Coronation is on its way.