I'm going back to basics with volumes etc to find the benchmark and will take it from there.
It's good to be back in the brewing shed!

Here's the recipe for anyone interested.
Recipe: Mad Dog IPA
Style: 14C-India Pale Ale(IPA)-Imperial IPA
Recipe Overview
Wort Volume Before Boil: 32.00 l
Wort Volume After Boil: 26.00 l
Volume Transferred: 23.00 l
Water Added: 0.00 l
Volume At Pitching: 23.00 l
Final Batch Volume: 23.00 l
Expected Pre-Boil Gravity: 1.041 SG
Expected OG: 1.051 SG
Expected FG: 1.013 SG
Expected ABV: 5.0 %
Expected ABW: 3.9 %
Expected IBU (using Tinseth): 72.0
Expected Color: 10.3 EBC
Apparent Attenuation: 72.9 %
Mash Efficiency: 85.0 %
Boil Duration: 90.0 mins
Fermentation Temperature: 18 degC
Fermentables
UK Pale Ale Malt 4.824 kg (96.2 %) In Mash/Steeped
UK Torrified Wheat 0.193 kg (3.8 %) In Mash/Steeped
Hops
UK Bramling Cross (5.8 % alpha) 52 g Loose Whole Hops used All Of Boil
UK Challenger (6.5 % alpha) 48 g Loose Whole Hops used All Of Boil
UK Golding (5.9 % alpha) 32 g Loose Whole Hops used 15 Min From End
NZ Cascade (11.2 % alpha) 40 g Loose Whole Hops used At turn off
Other Ingredients
Gypsum 3 g used In Mash
Epsom Salts 3 g used In Mash
Gypsum 3 g used In Boil
Protafloc 3 g used In Boil
Yeast: DCL S-04-SafAle
Mash Schedule
Mash Type: Full Mash
Schedule Name:Single Step Infusion (66C/151F)
Step: Rest at 66 degC for 90 mins