'… (iv) The question to be resolved is the safety or the degree or level of safety or safeness which persons generally are entitled to expect. The test is not that of an absolute level of safety, nor an absolute liability for any harm caused by a harmful characteristic. (v) In the assessment of that question the expectation is that of persons generally, or the public at large. (vi) The safety is not what is actually expected by the public at large, but what they are entitled to expect …' (Emphasis in the original.)