Copper Pipe to Plastic Pipe

I am replacing a radiator following some building work and need to connect 12mm Plastic Pipe to my current 8mm Copper Microbore.

Is the most suitable method just fitting a compression reducer (12mm to 8mm) and are there any problems with connecting Plastic to Copper?? Or are there more suitable methods of connection etc?

Thank you in advance...

As long as the joint is made properly then there are no problems.

8 mm heating is very much on the lower edge of being satisfactory from a flow rate aspect. That makes balancing quite important. Although the high resistance of the small tube has a self balancing effect if the lengths are similar.

Tony