I thought I would post an update since I brewed the beer today.
I ended up using the same grain bill and hoped I got a better efficiency, and I did

final volume of 23ltrs at 1045, so well happy with that.
I managed to miss off the 120gm's of caramel/crystal from my order hopefully not a deal breaker I'm guessing it adds colour mostly?
Getting the mash temp. right didnt' go too smoothly, I calculated the strike temp. to be 76.5 for 8ltr liquor to 4.3kg of grain. heated the liquor to just over 80, put it into the (warmed) mash tun and it was a bit under the temp. I had a kettle of boiling water so added this, and another ltr of water at about 80. now of course the volume has gone up so the strike temp. doesn't need to be so high, aaargh! quick calculation and I thought I was about right, stirred in the grain and found to be a bit low, doh! added more boiling water, too hot, added cold in 500mls and got it down to just .5c under my target of 66, oh well, left it at that for a while, boiled up some more liquor and after 45 minutes added some to raise the temp up to about 67c. So, not the smoothest mash in history but hey I can only get better!!!
Other than the mash and the missing crystal malt it went well, I followed the tips on here for making a starter bottle from the wort with the SF - 04 and got the yeast going well before pitching. I sneaked a taste after adjusting the volume / gravity and it was lovely! Quite surprised how hoppy it tasted after making the ipa last time, I was expecting less hops but I'm not complaining, I'm still new to this so it's a learning curve.
It's fermenting well at present so fingers crossed for a good beer!
Cheers,
Wayne.