The land adjacent, locals say, is the site of a former colliery spoil tip, which was landscaped in 1976. Now they fear any development on the land could result in a landslide as well as flooding.

A colliery spoil tip collapsed, catastrophically engulfing a primary school and surrounding houses on 21 October 1966. "I was reading the testimonials from Aberfan last night and one of the ...