A challenge to her leadership looms, but Prime Minister Theresa May dwelt on the emotive issue of immigration to sell her controversial draft agreement, suggesting ``software developers from Delhi`` would be preferred over EU citizens after Brexit. The required number of 48 Conservative MPs to trigger a leadership contest has not yet been reached, but her party lawmakers continued to make their positions known, with hardline Brexiteer Boris Johnson insisting the draft agreement is a ``585-page fig leaf (that) does nothing to cover the embarrassment of our total defeat``.Indian and British companies continue to monitor the Brexit imbroglio closely. There are already reports of delayed or curtailed investment in the UK and staff-and-office moves to EU cities such as Paris and Frankfurt to enable companies to continue to operate across the European Union. Seamless immigration from within the EU was one of the key reasons for the `Leave EU` vote in the 2016 referendum. May expounded on the issue in her address to the Confederation of British Industry (CBI), noting she had an ``intense week`` ahead.After Brexit, May said, ``London will regain full control of the UK`s borders, enabling it to set its preferred immigration policy.