Lindsey, thanks ever so much for your most excellent comments. If my stuff 'Inspires' just one modeller to have a go at something similar, then I am one happy bunny and could ask for no more.
I hope I've now made enough rubble and general detritus. I won't really know until I've spread the stuff over the base.
Ripped down coffee stirrers for rafters and general woodwork, foam board off cuts for bricks and smashed off render, kitchen foil corrugated sheets, card roof slates/tiles in random shades, kebab skewers for telegraph poles, stripped down electric copper wire for some cables and used drinking straws cut down for some lengths of guttering. The last lot of rubble etc., I've painted a lot darker shade to simulate scorching and smoke damage. The saturated toilet paper under the rubble will be curtains and general loose fabric.
Hopefully, tomorrow I can randomly scatter the above concoction on to the base. I just hope there is enough.
Cheers.
Ron