I bought this set http://www.ebay.co.uk/itm/Spline-bit-set-/261168338112?pt=UK_Hand_Tools_Equipment&hash=item3cced894c0
It has the m8 splined bit needed for removing the banjo bolt.
I was £8 from my local autoparts store.
So have you managed to change it?
I found that I did not have enough room to get under and undo it with my ratchet?
Not yet. I have had my APR pump and new cam follower for a few weeks now but been too busy with work to be able to get time to do it.
I'm planning to use a bit of tape on the splined bit and use a ratchet spanner for removing the bolt.