Subwoofer DIY circuit or kit

I'm looking for either a kit or PCB for a really good quality subwoofer amp, mono, around 150W to 300W. Another thread on this forum suggests the honey badger, but I couldn't find any links to it.

Rod Elliots ESP projects site includes options but I'm guessing the circuit is dated now and the components unobtainable (I don't yet feel comfortable choosing substitutes).
Also it seems odd getting PCBs shipped from Australia.

Any recommendations for UK