I work in HR.
Legally, employees have the right to ‘reasonable’ paid time off for maternity appointments and antenatal classes. There is no legal definition of what counts as antenatal care, so it can cover just about anything pregnancy related.
I will repeat this for those at the back (or the ones who want to ignore it and hope it goes away):
Pregnant women in England have the legal right to paid, in working hours, time off to attend medical appointments, scans, NCT classes, pregnancy yoga, relaxation, meditation, parent craft, breastfeeding, kegels, visits to the birthing suites, the list really goes on and on - basically ANYTHING recommended by their GP, midwife, etc PLUS the travel time. Employers who refuse requests could very well find themselves defending their refusal at a tribunal, so they had better be sure they have a rock solid reason for refusing. If your employer unreasonably refuses to allow you to take time off for antenatal care or refuses to pay for all or part of your time off you can bring a claim for loss of pay in an employment tribunal under section 57 (section 57ZC for agency workers) of the Employment Rights Act 1996.
It doesn’t matter if you are an employer and you aren’t happy about it . It doesn’t matter what it says in the company maternity policy. The law takes precedence. No you can’t make them ‘go on their own time’ (and if you ask them to then you are probably breaking the law). Employers are also not allowed to request the time is made up.
Have a look at ACAS and maternity action for more information about requesting time off for appointments.