Folk London does not carry a sessions list. For anything east of the Lea try here. There may be the odd ommission where participants don't want the session publicised.

Walthamstow Folk have a short session before the club starts and in the interval. Normal club admission applies for this.

There is an Irish music circuit centred on Hammersmith and Camden with little overlap with the English folk club scene. Karen Ryan of London Lasses is a good contact for these.