A GIANT 235 tonne National Grid transformer caused traffic problems as it made its way through Gloucestershire on Sunday.

The electrical transformer trundled up the M5 from Bristol at a speed of 10mph, causing tailbacks and some small delays on an already busy travel day.

Passenger Lana McDonnell took this video of the huge vehicle as it passed Junction 13 near Stroud.

The transformer, escorted by a police, was being transported to replace equipment at a substation in the small village of Iron Acton.

It began its journey from Avonmouth Port in Bristol at 8am and arrived in Iron Acton until between at 3pm.