According to Routesonline:
BT649 TLL1600 – 1700LGW 73C 2
BT649 TLL1655 – 1755LGW 73C 6
BT650 LGW1745 – 2235TLL 73C 2
BT650 LGW1840 – 2330TLL 73C 6
Trying to work out if / how this fits around BT's existing services in Tallinn. Either more to come or something else going?