Transferring between Terminals at LHR

Not been at Heathrow for some years and with an upcoming flight where i have to change terminals - how easy is it to transfer between Terminal 1 & Terminal 4? especially with a 4 year old!
Originally posted by motherger
Cheers Neil,:)
With BA all the way so will check bags all the way through from GLA.Flight gets into T1 at 14.05 then flight from T4 departs at 16.15.So will also get checked in all the way through as well.