There's a few things wrong with your post, firstly TVR isn't your typical kit car company becuase they arn't a kit car company, they are a proper manufacturer. Secondly the only engine TVR ever really made themselves was the Speed 12's V12 and even that was essentially only two AJP6's bolted together. They were heavilly modified ofcourse, but that's essentially what that engine was. The AJP8 and AJP6 engines were designed and manufactured by Melling Power, not TVR. TVR have never had the facility to built thier own engines, they've always outsourced for this be it the Rover V8, Kent, Essex V6 or the AJP6 and 8 engines, none were designed and built inhouse by TVR. The AJP8 and 6's were more specific to TVR but they were still designed and built by Melling Power..
That's why I have no issue with this news that TVR might outsource the engine for thier next car, shock horror, it's only what they've always done. Building your own engine for a low volume car is highly impracticle and very costly, if they could build an engine and source that engine to other companies then there may be a reason for TVR to start making thier own engines, but that's a very unlikely scenerio.
. The "shock horror" was only meant as dramatic license. The curse of the keyboad response I suppose.
