Lion is probably the last possible variant exploitation of the class 47 mechanism available to Heljan. Never forget with Heljan that it is still a family owned outfit, and the family trade is making injection moulding tools. For the typical model making company that is usually the high cost investment in plastic model making, because toolmakers command high pay rates; but if the owners are doing it for themselves that bill effectively disappears as they will be paid out of the trading worth of the company. So they can afford to do what will undoubtedly be a low volume run.
Their next product line of this type appears to be the various BR railbus types. Same pattern of behaviour, several different bodies on what will probably be the same basic motorised chassis.
That said, I am pretty sure they will steadily take on all the remaining BR Bo-Bo types for which there are no RTR models. They are well into the minor stuff now, classes 35, 17, 15, 23, so if their retail partner in the UK tells them there is a market for other Bo-Bo types they will likely press on. Don't forget there are classes 16, 21 and 29 though, before anything south of the Thames can be looked at.
