[richy27]

I'm with Dave Lee on this one. Explain the risks to the customer and if they are willing to take the risk then do it, if not, walk.
What you learn over time is that is better to leave certain jobs than take them on knowing there is a risk. And if you take them on and there's a problem your client quickly turns into the customer from hell and you end up kicking yourself for not have listened to the alarm bells that were ringing in your head in the first place.

Simon

spot on