Ok my mistake regarding hostile terrain. There are plenty of parts of N England and most of Scotland where one could land instead of going IMC. I appreciate that other parts of heavily forested/ desert/polar world won't have that option. When I referred to forced landing I acknowledged that a forced landing might be due to weather and not an engine failure. Im not saying that SE flight where you couldn't land en route shouldn't happen, just that that's one loses that option and therefore cannot be used as mitigation for inadvertently going IMC.