Thanks for those guys.
The Sonic Studios sled has been recommended to me, and is probably the way I will go - not sure about the alkaline batts, as its not enviro friendly ! However, they do apparently last much longer in the machine. Might get away with two lots of batts 2 hours each and then I can use rechargeables ?
If anyone uses a lead batt for this jobbie please let me know.
Cheers,
Linz