I stumbled across this link from SeedSummit the other day – they have produced standard term sheets for seed deals, including an EIS compatible version. While many investors will not choose to adopt this, I think its good for founders to see a model term sheet so they have a point of reference for comparison.
The page also links to a handy one-way NDA generator on FireLex developed by the same people.
I don’t believe that finding documents on the internet is a substitute for professional legal advice, and I should point out I’m in no way qualified to comment on the quality of these documents!