Had a reply from the lads @ OcUK, as suspect the tube was cut to two lengths, so that's ok. They said the performance of the 1450's and the 1850's is no different so that's why they stuck those in.
Consequently, I've ordered another length of hose which should be coming thursday, and sorry Mingey, but I've ripped you off and ordered a CM Haf 932 side panel. You're right, that grill on the side of the Haf-X would hide everything.
Does this sound ok for step by step:
1 - Take out cards, and run off IGpu.
2 - Install Blocks on cards with barbs.
3 - Flush out rads with tap water.
4 - Screw barbs into rads.
5 - Install rads and cpu block.
6 - Put barbs into res and install res.
7 - Hose up.
8 - Put CPU blanking connector onto 24 pin psu plug.
9 - Fill res with coolant, turn on power.
10 - Continue to fill res until loop full.
11 - Leak test.
12 - Get air out.
13 - Connect up 24 pin to board.
Boot rig.
Any input would be much appreciated.