Original sketches which were the working designs for Birmingham’s famous bronze bull have been sold at auction after being discovered following the sculptor’s death.

The portfolio of 14 signed drawings, found at the home of Laurence Broderick, were bought by an online bidder in the UK for £2,600 plus fees, said Batemans Auctioneers.

Notes by Broderick on one say the “14th drawing and it was the drawing I decided to make”, revealing the chosen design from which the 4.5m statue outside the Bullring was created.

Stephen Drake, of Batemans, said he was visiting the family’s home to assess related works when in a “fantastic moment” the portfolio was pulled out from under a bed.