
An electricity business which supplies 40,000 small businesses has gone into administration, the BBC has learned.
A buyer was unable to be found for Electricity 4 Business (E4B), which is based in Milton Keynes, energy regulator Ofgem confirmed.
Customers will not be disconnected but will automatically be transferred to another supplier in a process organised by the regulator.
Customers' tariffs may change but they will be free to switch supplier.
Nobody at E4B was available to comment.