The second series of Sonic X (#53-78) begins airing here on Saturday 5th November @ 2:00PM on the Jetix Channel. And @ 3:00PM on Jetix+1.
Ep54 airs on Sunday 6th November at the same times.
I dont know wether the new series will air during the week, or just weekends.
During the week its at its normal double bill times.
Source: Sky Guide/Radio Times.com (logged in & with Jetix added to the listings)