Can I take issue with the nice slate roof? It looks like it is a recent replacement in one of the artificial slates so wrong colour and the 'slates' are thinner and more regular than real slate. The ridge and hip cappings are the most obvious difference to how it would have looked. It probably had lead ridge and hips with wood cored rolls. Galvanised iron (usually painted) or mitred hips are also traditional on slate roofs but less likely in this situation.