LePou Plugins has released the Poulin HyBrit Series, a collection of three free VST effect plug-ins for Windows that feature a hybrid amp model based on two famous British amps.
The plug-ins include a "PLS channel" that is a hybrid of the two (tweaked) channels (Normal and Treble) of the real thing. Both channels are actually processed and the mix of the two signals can be adjusted through the PLS MIX knob. Another channel, MCJ, is also a tweaked version of the real thing.
This amp simulator doesn't represent anything specifically but it does have the character of the British amp.
The three versions: