I think the OP might need to remove his/her severely rose-tinted spectacles and realise that modern high-speed train design starts with the fundamental engineering requirements and designs a shape that will achieve these as efficiently as possible, optimising cost, weight and energy. As soon as you take the 'draw a shape, make it work afterwards' approach, you're an architect / concept artist not an engineer.
The APT was a shape designed in the 1960s for a top speed of 160mph, in the days before computer modelling (of any high standard) was available to calculate complex air flows, turbulence etc. The HST was developed around the same time and testing was limited to use of models in wind tunnels, which ultimately redesigned the nose cone shape from the prototype to the production power car. However whilst the Class 43 and APT are 'streamlined', neither would come anywhere near the optimal shape required for an HS2 train designed for 225mph. For one thing, the vortex under the nose would be horrendous and impose a severe drag, with a massive energy cost. There is a reason why modern designs (Shinkansen, AGV etc) have flattened front ends.
Perhaps also remember that in originally designing HST and APT, British Rail were attempting to ape the Japanese Shinkansen's 125mph train from the 1960s. Obviously it turned out very different as a design and a train, but it's not as if we lead the world or anything, other than briefly producing the world's fastest conventional diesel train. Dare I say it, but as a member of the current younger generation, I can't stand hearing 'British is best' without any rational logic or reason to back the argument up, except some misguided sense of backward-looking patriotism. If our common sense extends to 'it looks nice and has a Union Jack therefore it must be a winner' then we've finally gone and turned into America.