 Hove Council insisted that the road must run entirely to the north of Mile Oak, rather than passing through it; this pushed the route further north and added engineering complexity, and the Department for Transport stated in 1982 that the budget would have to increase by £5.75 million to accommodate this change.Another disadvantage would be that it would sever Mile Oak Farm's buildings from its farmland.Construction started in 1989, but the section between Mile Oak and Southwick Hill Tunnel was the last to be built, between 1993 and 1995.