there seems to be some mixed responses here, so for clarity
OML is 6 months
AML is 6 months
SMP is 9 months
on OML you accrue a/l as per your contract
on AML you accrus a/l according to the statutory minimum which is currently 20 days pa, but goes up to 24 days pa from Oct 07.
The other thing to check is whether you are allowed to carry leave over from one leave year to another - I ended up using some accrued leave before I went on m/l so as not to lose it as we are only allowed to carry over 10days, anything above this is lost according to my T&Cs.
This is a direct quote from the [[http://www.dti.gov.uk/employment/employment-legislation/employment-guidance/page34244.html DTI site}}
ANNUAL LEAVE AND MATERNITY LEAVE
Employees on maternity leave retain their entitlement to statutory annual leave (four weeks? paid leave per year) throughout ordinary and additional maternity leave. If the employee is also entitled to contractual annual leave (that is, annual leave that is provided by her contract, on top of the four weeks statutory minimum provided by law) she will continue to accrue this additional, contractual entitlement during Ordinary Maternity Leave. She does not, however, have an entitlement to continue accruing contractual annual leave during Additional Maternity Leave unless she has agreed otherwise with her employer.
It is not possible for an employee to take annual leave at the same time as maternity leave. It will, though, usually be possible for an employee to use any untaken annual leave either before she starts her maternity leave, or once her maternity leave has finished.
She could, for example, agree with her employer that she will take two weeks? annual leave immediately before starting maternity leave. This would mean that her last day at work before maternity leave was actually two weeks before her maternity leave began. It should be remembered, though, that if the baby is born early the maternity leave must start from that point.
Employers and employees will often find it useful, once the woman has given notice that she is pregnant, to incorporate annual leave arrangements into their planning. This is particularly important if the employee plans to take a whole year?s maternity leave, as it is not possible to carry over statutory annual leave from one leave year to the next, or to pay the employee in lieu of any untaken statutory annual leave unless the contract is terminated. It is, of course, up to the employer and the employee to agree between them whether to carry over or provide pay in lieu of any untaken contractual annual leave above the statutory minimum.