I at least got it looking at the correct vlan
Changed my DHCP scope to

ip dhcp pool data
network 192.168.14.0 255.255.255.0
default-router 192.168.14.1
option 156 ascii"configservers=192.168.15.200,ftpservers=192.168.14.200,layer2tagging=1,vlanid=15"
!
ip dhcp pool shoretel
network 192.168.15.0 255.255.255.0
default-router 192.168.15.1
option 66 ascii "192.168.14.200"
option 155 ascii "192.168.14.200"

What doesn't work is the config server, the entry is still unpopulated on the phone.

Any idea's would be great please.