So small update I made some progress:
I added the following routing config to the f5:
access-list 10 permit 222.222.222.0 0.255.255.255
route-map bgpmap1 permit 10
match ip address bgpout1
router bgp 100
redistribute kernel route-map bgpmap1
This caused a prefix to get announced and accepted but it is only a /32 and I need it to be the whole enclosing /24 any idea how I would achieve that anyone?
Oh and in other news im glad to say the /32 prefix does indeed get withdrawn if the DNS servers stop answering queries.
Brett