It seems a tad on the high side, but on the other hand, its got DCC Sound, includes a smoke unit, has working head and tail lights, a close coupling mechanism on the tender and the amount of separately applied detail in the form of all the external pipework alone would be expensive to fit. The only possible downside is that it has traction tyres...
If the Hornby P2 wasn't "Design Clever", had external valvegear and was fitted with DCC, full fat sound, lights and smoke, then that too would be a pretty expensive proposition.