In contemporary layout's people don't use overhead wires for electical current anymore, probably because of live wire issues over the layout, making it more risky to change point's manually and dring maintenance.

Also, I think, because of the lack of avaliability of catenary masts; there doesn't seem to be much on offer in UK. There is little to no choice, either you chose Dapol or electron probably the only companies to sell in the mainstream market in oo/ho gauge.