Home-survey and valuation: Either, neither or all?

Heres_the_deal

We've got to the point where we need to consider a home-survey.

It's for a house forming one of sixteen properties on a small mid-90s development, all the properties were built by a local well respected builder to a decent standard. Walking up and down the street, there appear - to a lay person - no obvious problems. 

I'm more inclined to pay the £450 for the survey, however, is there any advantage in paying another £50-80 for a valuation when the lender already valued the house at 4% lower?

Edit: Wrong forum...sorry