Sent a message to the seller of the mono pump and he
regularly drives down the M1 so he will bring it
Derby way if I win the auction so no postage to factor in
I did a page on Mono MS's here ...
http://www.biopowered.co.uk/wiki/Pump_-_Mono_MS Seller doesn't say if the pump works. Might be worth asking if he knows, but tell him not to run the unit dry.
Spares are readily available, but a bit expensive. Most likely problem will be the stator circa 50 quid (Viton stators are available to replace the standard Nitrile ones). Only other parts that go are the rotor (lots of money, but last a long time)and the seal ... see the page above for referbing.
They are great pumps. If you can get it at a good price you won't regret it!