Well I had a decent look at it today. Apparently according to the instruction plate you use Ether Capsules. There's two plungers, one has a screw top which you remove and put a capsule inside, you put the lid back on and push the plunger down therefor piecing the capsule. The other plunger is then used pump the ether into the engine.
But...there was no capsule in it so it obviously doesn't need it even with the weather like it is at the minute.
From memory, thinking about it now, there is a place to store the capsules in one of the lockers. I'll have to have a look and see if there's any in there.
Regards
Richard