I have an employee of a company (not a Director) who has not taken a salary this month.  So a tax refund has been generated.  This tax refund has been paid to the employee. 

Can I just show this as Cr Bank, Dr PAYE?

I’m not sure if I need to show more.

Many thanks.

Why have HMRC issued a refund in March just because an employee didn’t take a refund?

If they have and the refund has been paid into the bank then you Dr Bank, Cr PAYE

If it’s just because his personal allowance for this month hasn’t been used and nothing has actually been paid into the bank then you Dr PAYE, Cr wages control and net the PAYE refund off your next payment to HMRC (unless they do issue a refund before your next payment).

A little late, but still.

Assuming there are no other related transactions, and he/she is the only employee, then the full double entry would be:-
Dr PAYE & NI Control
Cr Wages and salaries control
With the amount of the refund - this is the posting from the payroll records.

Dr Wages and salaries control
Cr Bank
With the payment to the employee.

Dr Bank
Cr PAYE & NI control
With the refund from HMRC.

If he/she is part of a bigger payroll, then the individual’s tax refund simply reduces the remaining PAYE figures, and increases the total net pay payable.