From M1:
Drive down the M1 to Junction 1. At the roundabout, take the A406 towards Wembley/Hanger Lane. At the next roundabout, take the 3rd exit onto the A5 towards Edgware. Follow the A5 for 2.2 miles. After passing the ASDA superstore on your left, continue through the traffic lights. Cavendish Banqueting will be on your right, just after the lights.
From M25:
From the M25, take Exit 23 at South Mimms Services. Follow the A1 Southbound towards London. Continue straight at Stirling Corner on the A1. At Apex Corner, take the 3rd exit onto the A41, signposted Aylesbury, Watford, Harrow. Continue for 1.5 miles to the next roundabout. Take the 2nd exit, signposted Harrow, Stanmore (A410), and Edgware (A5). Follow for 0.2 miles to Cannons Corner, then take the 1st exit onto the A5 towards Edgware. Continue for 2.3 miles. When you see Mercedes Benz on your right, Cavendish Banqueting will be on your left.