Export bar placed on John Logie Baird archive in effort to keep it in UK

Historic 'treasure trove' of materials linked to TV pioneer is at risk of being exported from Britain unless a buyer can be found

An export bar has been placed on an archive from John Logie Baird's first transmission of trans-Atlantic television pictures in the hope that it will prevent the materials - which include the first use of the acronym TV - leaving the UK.

A UK buyer will need to match the 78,750 asking price for the archive, described as a "treasure trove" of materials, for it to remain in Britain.