These were two experimental boats built by Thornycroft early in WW2. MTBs 106/107 were essentially similar but had unstepped hard chine hulls. The plan I've attached has been offered for sale on Ebay recently; it seems well drawn and credible except for the torpedo tube arrangement. I know that Bloodhound had something like this, but this hardly seems likely on a boat only 45ft long. Does anyone know anything about this?
The only photo I've been able to find is of MTB 104, but it's a .jpeg and I can't work out how to upload it. It appears to have the usual CMB type torpedo trough.