To ensure uniformity, when conducting car or vocational tests and ADI qualifying examinations. Only assess the candidate’s ability to control the vehicle and do not consider it as a fault if, for example, they do not hold the steering wheel at ten to two or quarter to three or if they cross their hands when turning the steering wheel. The assessment should be based on whether the steering is smooth, safe and under control.
The above is taken from The Driving Examiners Manual. https://www.gov.uk/guidance/guidance-for-driving-examiners-carrying-out-driving-tests-dt1
Where appropriate it has been reformatted and edited so it only refers to the driving of ordinary cars (class b).