ABS came with the machine so no PLA available.
The bed temperature displayed in the software never changes from 60.4 degrees C even at switch on! The bed heats up but there's no way of knowing how hot it is. I left it heating for half an hour and it's just possible to touch so estimate 60 degrees is about right.The user manual suggests over 100 degrees is needed.
Thanks for your suggestions, I just found a setting in Maintenance to pre-heat for an hour so will try that next with no raft. Will keep you posted.