Hi Josefs, £400 does not seem too bad a budget for a camera, I found it's the other stuff that is the killer once you have the camera. If you do not get anything sorted I might be selling my MPP. It is however a metal folding camera (with limited front movements), not a monorail and so might not be what you want but has got a cone lens panel for wide angle (90mm) stuff and a 90mm angulon which I had serviced before I got a 90mm Super Angulon about a week later (doh).
If you want, I can also make enquiries with a local dealer as well and ask him to have a look. I recently traded my Cambo in against a Sinar monorail from him so he may have a Cambo. I am in the North East however.
Also depending on what you want it for and the focal length you are intending to use, you might need to consider bag bellows for a monorail if using wide-ish lenses.
If you order from the USA and customs get their hands on it, I think you will be charged VAT (20%) so it might be costly.