Don't bother with a general survey. Get individual survey reports from;
Plumber and/or drain survey
Overall price will be the same but you will get a lot more detail.
Bear in mind, with all these surveys, and especially if you're buying an older property, you'll probably be told the house is likely to fall down, blow up or give you an std.
The reports are extremely verbose, don't be worried that's what they're paid to do.
However on the flip-side, when were selling our first house, our buyers wanted to re-negotioate due to possible detection of rot in our wooden floor downstairs after full surveys were under taken.
The entire downstairs floors were sold concrete.
Subsequently we discounted the report and didn't budge on the price – as it's often a dirty trick – and the people still bought it.