PAS128 is a new British standard for utility surveying, prior to which the utility detection industry has been unregulated. 
Please visit the PAS128 website on www.pas128.co.uk to learn more. 
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PAS128 provides a benchmark standard for the detection, verification and location of underground utilities. 
Currently PAS 128 is a voluntary standard, but it is being adopted by most reputable utility survey providers. It provides four different levels of survey type.
Survey types
●    Type D:
Desktop search. Location of underground structures determined by a review of existing records from service providers.
●    Type C:
Site reconnaissance. Site walkover to identify utility features visible above ground.
●    Type B:
Site detection. Site survey utilising survey techniques including Electro magnetic locating (EML) and Ground Penetrating Radar (GPR). There are varying degrees of sub-classification which will specify the accuracy of the survey.
●    Type A:
Verification. Typically by excavating the utilities or lifting manholes to visually identify the utility. 
Just Surveys Limited are able to provide reports to all PAS128 specifications. 
Please contact the office if you require further information. 
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“We recommend that all our clients engaged in the detection, verification and location of active, abandoned, redundant or unknown utilities familiarise themselves with PAS128.”
PAS128 is available online from the 
British Standards Institution Shop