Are you still looking for a pressure washer?
I am looking to sell a petrol driven cold pressure washer, model: Karcher HD830BS. It's only a few months old and hardly been used - it still looks brand new. Let me know if you require full spec. I do not have extending lance attachment, but have a contact who can provide accessories for this machine at a great price.
P.S. I'm based in Newcastle-upon-Tyne and would be able to deliver within a reasonable distance if you're not too far away.