Definitely do it, PD engines are rock solid and the true potential is only realised post remap.M1 corridor is regular for me, would be happy to tune it or you can visit us in Leeds for a run on on our AWD dyno.
I have had my diesel Anni 4 years now but never taken the step to remap it as im scared of other issues like turbo and pipes messing up. I have a full miltek exhaust from the turbo back. If i get a remap i will get a sach uprated clutch at the same time.