ASR9001 : MPLS LDP missing?

I have installed the A9K-9001-AIP-LIC license and I'm using the Cisco IOS XR IP/MPLS Core software but for some reason I cannot seem to enable 'MPLS LDP'.

If I type 'MPLS ?' then I get the below options but not MPLS LDP:
ip-ttl-propagate
ipv4
ipv6
label
lsd
static

I'm obviously missing something and I'm hoping it's not another license. New to IOS XR so it may be that I'm doing something silly. Actually more likely to be this :)

Thanks