These questions are being answered by Learn HR, a market leader in the provision of HR and payroll training and nationally-recognised professional qualifications.
Q: “We put new starters on a six month trial period during which we can dismiss them with only one week's notice. Does this period count as part of their continuous service?”
A: Yes it does. The law does not differentiate between different types of contract when calculating continuous service. They are your employees throughout the whole period and thus the trial period counts towards continuous service.