By Jon Robinson Jeremy Clarkson’s Hawkstone brewery and sportswear brand Castore, which is backed by Sir Andy Murray and the billionaire Issa brothers, have been named among the fastest-growing companies in Britain. According to the annual list published by The Sunday Times, digital bank Allica topped the latest standings with sales of £191m, a growth of almost 537 per cent over three years. Castore, which placed 34 in the new list, was named the second fastest-growing company in Britain in the 2023 edition. The Manchester-based company recently made its first acquisition since it was valued a…