Aaaaargh, superceded, superceded, superceded.
Would be a bit at a reception class not adopting a predominantly synthetic phonics approach and I would ask them why they are flying in the face of government research recommendations being adopted across the country, if I went to look round and saw a predominance of letterland stuff in the classroom.
Nursery is different to pre-school so if the nursery does not have a pre-school section then perhaps they can take a different view.
From what I discovered from in ds's pre-school days, jolly phonics was adopted after his pre-school researched the methods being adopted by local schools which most of the children eventually attended. It was offered as part of a 20 minute, sit in a circle and focus, type section of the day, preceded and followed by lots of lovely dressing up and painting, playing with friends and making stuff from cardboard, wool, oodles of glitter & way too much glue, type activities. ds became a whizz at the basic 26 phonic sounds and could recognise lots of mundane words like days of the week, and months of the year plus numbers up to about 100 as he was full-time and got a daily dose unlike some children who attended for say three half days a week. Although he didn't read out loud before he started school I suspect he then just needed the reception class environment as it all fell into place in a matter of weeks last September.
One of the functions of the pre-school environment and indeed why this is subsidised for all pre-school age(or over 3 years old) children is that starting to practice focusing on the demonstration from a lead adult to pick up a skill or listening to a short story in a group without wandering off to do something else is a stepping stone to easing the transition from not being in school to having to attend school each day. For some children this will be as much as they take on board however, IMHO a good pre-school will also let those capable of a bit more take on board some letter work, learning their sounds and if pen control is good enough, copying them down and practising them. Ds loved doing this and I do not believe I would have acted in his best interests to deny him access to letters/words and numbers or have to fulfil his preference for these activities at home when it could be so easily accomodated by the pre-school.
It's not about denying them their childhood years of playing, its about meeting the individual child's needs in the last 2 years before they start school and making the transition to school as easy as possible.
So to sum up no, maybe a nursery doesn't need to use Jolly Phonics although I'm a bit shocked that they hadn't heard of it. However if they have a pre-school section I'd be a lot more worried about their ability to prepare your child for a smooth transition to school be that using JP or any other method.