Boots is moving closer to a London float after Australian pharmacy Sigma pulled out of talks, but billionaire Weston family are still in the running.

Australian pharmacy giant Sigma has walked away from talks over a £7.5bn private takeover of Boots, renewing hopes of a London float.

Sigma Healthcare has been seeking to expand in the U.K. and had last month partnered with British pharmacy chain Greenlight Healthcare to rollout Chemist Warehouse-branded stores…