I think like you say with it having aggressive lines and lots going on it's made me unsure if I'm up to it as I've never tried a part like this  I've made split moulds in the past.

If you've made any split moulds before then you can make this, it's not as difficult as the aggressive styling makes it appear.

All those vents will have decent draft angles, so you just need to blank them off from behind. Might need a separate piece for the bottom of the front lip, and if you are keeping the returns on the inside if the wheel arches then they will need separate pieces as well. But the majority of this will be in one piece.

I'm Nottinghamshire, do you think it would be easy enough to attempt myself, I normally resin infuse my parts.

Plenty of places here in the uk that could help. Biggest thing will be your budget and how many parts you want to make and in with what process?
From a squint on my phone i reckon there wouldnt be too many splits and possibly a couple of inserts for the lights.
Where are you located? 

How much roughly and where in the UK could I have a mould taken of my bumper, now I normally make all my moulds but no sure I feel confident making one from this.
Thoughts on how hard it would be?