The trouble is busybee99, particularly for big employers, that group could be quite big. Yes the scheme might be cost neutral to run generally, or even slightly financially beneficial, but if an employer only offers SMP, and has a workforce profile that has a lot of women of childbearing age, they could be looking at large additional costs that were not factored in when they initially starting running the scheme.
There could be potentially a whole year's worth of vouchers having to be supplied completely free of charge to any woman in the scheme who gets pregnant a second time, which let's face it, quite a lot of women do! In something like, for example, retail, where they often have lots of mums working because of the part time hours they can do, that could be a lot of money. In other sectors, or in businesses where the workforce profile is different, the impact could be a lot less.
For smaller businesses who run a very tight budget, especially in this climate, but can just about offer the scheme because it doesn't cost them anything, even one woman going off for a year and requiring a year's worth of free vouchers can be crippling. Most of my clients are small businesses, and I do encourage them to think creatively about benefits they can provide at low or no cost because they are on small budgets. Now when advising them about options for low cost benefits to offer I make sure they are fully aware of the potential cost of offering childcare vouchers should someone take them then go off on maternity leave.