Ok only just seen this…but as the owner of FYH535 see the color picture I feel qualified to comment.
The vehicle in question B135MX was originally bodied by Park Wark and sold to Frank? Moore of Moore & Wright Sheffield Ltd, the sale was through Jack Barclay Ltd London, as were B125MX, FYH535 and B201MX FYH536. It has a similar body to these. At some point in the early 1960’s it was re-bodied with the new saloon body from the photos and possibly fitted with independent front suspension, however this is only a deduction from the front on photos. It was sold in this condition by specialist dealer Frank Dale (here it will be worth asking them for their records) in this condition and eventually acquired in a sorry state by Mr S Gilmore (of Belfast) in 1994 whom set about making a copy of the E R Hall car, however this car had to my knowledge three different body configurations during its racing life, apparently Mr Gilmore has chosen the Tourist Trophy specifications, see the model held in Wroxton. Apparently this work is finished, although no contemporary photos are yet evident. However recorded as seen by Bernard King in 2009. Do have a look at similar conversion also a re-body B180MR.