So, my friend woke up this morning... no phone line, no broadband, etc. Called BT and they're sending an engineer... next Wednesday. 
It's obviously a power problem, as there are no lights on the modem thingy (fibre-to-the-premises boxes). Having been out all day, the though occurred to simply plug in another power adaptor - bingo, flashing lights.
Just not sure about the power ratings - the original plug says 12v, 1.0amp, and the replacement says 12v, 1.5amp. Both have a black nozzle at the end.
Is is safe to continue using? Will BT get upset at my friend?

It's obviously a power problem, as there are no lights on the modem thingy (fibre-to-the-premises boxes). Having been out all day, the though occurred to simply plug in another power adaptor - bingo, flashing lights.

Just not sure about the power ratings - the original plug says 12v, 1.0amp, and the replacement says 12v, 1.5amp. Both have a black nozzle at the end.
Is is safe to continue using? Will BT get upset at my friend?