Heptavac-P as annual routine.
Worm when necessary - if necessary.
Fluke if and when the vet advises it.
Flystrike preventative in spring for lambs, possibly a few weeks after shearing for ewes, again take vet's advice about which, when and what.
You may need something to deter ticks, lice, keds - ask your vet. Lice and keds just irrirate the sheep, and healthy sheep shouldn't get too affected, but ticks can carry disease, so it's worth keeping those little biters at bay.
If the land has had sheep before, you may find you have orf. It will affect lambs in late spring / early summer and you may need to vaccinate lambs if you find you have a problem. But don't vaccinate unless you know you have a problem, as the vaccine will introduce the disease to your property if you don't already have it.