A discussion on the new Heritage Action forum opened our eyes to an interesting and slightly disturbing question:

When was the last time a development was stopped or significantly altered as a result of unknown archaeology being discovered?

Picture of the Coliseum taken by Kevan Davis

The latest suggestion we had stepped outside our remit slightly and was the Coliseum under the Guildhall in London, discovered in 1988. Surely there must be a more recent example. Can you help? Leave a comment below or on the forum thread if you know of any more recent discovery which permanently stopped or changed significantly a development.