Thank you Steamy, for letting me know. 👍 I have done a google search but can only find cheap units that don't look like they'll do the job, or expensive units that are simply too expensive.
I have since found a place that rents them for £36 per day, so I'll probably be opting for that.
There is one review commenter that says he did not vacuum the lines, but it's an expensive unit so I don't want to break it.
If anyone is interested, I've bought an electriQ iQool 9000.