There is a setting in the BECM for daytime running lights.
I tried that setting on mine using me Nanocom, it made no difference weather selected or not I had no DRL's.
I do recall reading something in Rave about it only being used for certain markets, maybe that's why.
Edit. Just found it, copied from Rave.
Daytime Running lamps
This feature is a requirement for vehicles for the Canadian,
Norwegian, Swedish and Finnish markets.
On these vehicles, with the engine running, daytime
running loads will be active regardless of the state of
any switches.
This feature will in no way effect the operation of any
of the other lighting systems.
Maybe it's just for selected markets & by default it's turned off in the UK.
Now would a locked BECM allow you to change this, or would it need to be unlocked, I know mines locked.