Supply in the North London & Herts market, which has been one of the lowest across the Eastern M25 region over the past few years has adjusted upwards over the past 12 months, rising by 1.16m sq ft to 3.1m sq ft.  Grade A supply has accounted for 90% of the increase in space, with a number of Big Box and Mid Box units coming onto the market.  The largest is the newly refurbished Harlow 240 (235,500 sq ft), whilst 299.500 sq ft is available in two units at Panattoni Park Borehamwood.