From the  10/5/15 the price has gone from £169.90/year (equivalent of £14.16/month) to £183.48/year (equivalent to £15.29/month).

This is the third increase BT has made to it since last year. It last increased prices on 1 December 2014, when the price rose from £159.84/year (equivalent of £13.32/month). Prior to that, the price rocketed from £141 on 5 May last year.