By the way is it possible to have cable broadband and ADSL in the same house ?
Indeed it certainly is.
ADSL requires a BT phone line and cable broadband requires a cable connection, both of which are supplied completely seperately.
I know little about cable since I don't know anyone who has it, but i believe is uses a hybrid coax/copper pairs cable to supply services into the customer premises.
The coax supplies the cable TV and broadband and the copper pair is used to provide a phone line.
All of that then connects onto some kind of a fibre network in the street somewhere. The cable network is fibre to curb, not sure if it is fibre to the premises yet? You mentioned an engineer coming to install fibre?