partially over the existing North London Line, allowing for three trains per hour in both directions. DfT proposals in 2013 stated that this link would allow HS2 trains from the North of England to bypass London Euston and connect straight to HS1, enabling direct rail services to be run from Manchester, Leeds and Birmingham to Paris, Brussels and other continental European destinations. The proposed HS1–HS2 link was subject to some criticism and concerns were raised by Camden London Borough Council about the impact on housing, Camden Market and other local businesses from construction work of the link. Sir David Higgins, chairman of HS2 Ltd, recommended that the Camden railway link should be omitted from the parliamentary bill, stating that HS2 passengers from the North of England would easily be able to transfer from the HS2 terminal at Euston to St Pancras by London Underground, to continue their journey on HS1 to continental Europe. He also recommended that alternative plans should be drawn up to link the high-speed lines. At the second reading of the High Speed Rail Bill in April 2014, the link was omitted from the final proposals. Following this decision, London mayor Boris Johnson expressed the opinion that an HS1–HS2 link should instead be provided by boring a tunnel under Camden. Since 2014 there have been no confirmed plans to connect HS2 to HS1, meaning that Regional Eurostar services are no longer being considered. The prospect of an HS1–HS2 link was revived in 2018 when a proposal was put forward by engineering consultancy Expedition Engineering for HS4Air, a high-speed railway line that would create a link between the two lines across southern England. By running south of Greater London, it would also connect Heathrow and Gatwick Airports. This scheme was rejected by the government in the same year. Routes Due to track arrangements, customs and competition concerns and that the Eurostar terminal was located at Waterloo station on the south side of London regional Eurostar services were not to call at London. The Summer 1999 National Rail Timetable indicates the trains would have called at the following stations, with one train per day on the ECML Glasgow route, and two running to Manchester, one via the Trent Valley line and one via the Birmingham line. The faster train would not have called at stations between Stafford and Milton Keynes. East Coast Main Line Glasgow Central Edinburgh Waverley Newcastle