Was Gav saying that machine is 240 watts or giving an example?
If it's not written on the machine dataplate, the input fuse to the transformer and output from the transformer would give a guide.
A 1 A fuse x 240 V= 240 VA
A 10 A fuse x 24 V= 240 VA
VA x power factor (typ 0.9) gives watts.
267 Watt x 0.9 = 240VA
VxIxPF= w
See if anyone can read what their transformer is rated at, if no one can help, use that formula and see how it compares to whats available. Also try to compare sizes. The fuse ratings will be rounded off and may also have a safety margin, so not totally accurate or reliable.