Please check out the panoramic photo link below which will let you see some typical metal roofs commonly found on barns and other agricultural buildings here in the UK. Though not particularly scenic this type of galvanised corrugated steel roof has managed to preserve vernacular building at very low cost. The box framed farmhouse on the right is probably early 17th century.
I have never seen metal shingles on any roofs in England though folded seem galvanised steel and copper roof coverings are becoming quite popular these days.
