I don't see Sky Arts. I have simply lost Channel 11 here in Manchester.
If you are receiving from Winter Hill it appears that Sky Arts is broadcast on COM5.
It may be worth checking whether others from COM5 have gone AWOL, eg. 17 Really, 19 Dave.
If these are also missing you could try a manual tune for channel 31 - should bring up over 20 channels including:
- Sky Arts