If the brake pipes are crossed, TC will be locking the wrong wheel when traction is lost.
 
thought pipes ran from block straight to caliperss via the odd connector

True, but not hard to get them crossed if replacing. With ABS/TC the right line has to go to the right wheel or the sensor that detects a locked or spinning wheel will release/apply the brake on the wrong wheel. All 4 brake lines operate independantly with ABS and either the 2 rear or all 4 operate independantly with TC.
 
I can tell you where the rear pipes should go. I made a note when I did mine:-

top 22 is RHR
bottom 21 is LHR
 
......cymbals!

Disconnected pipe 22 at the master with the rear end off the ground, slackened bleed nipple on rear right, assistant pressed brake and nothing at caliper end. Plenty fluid on the cloth under the bonnet though. Connected all back up again, fitted my new calipers all round and bled the whole system. A bit more peace of mind now. Turns out they had been connected correct way round but I had to check. The brakes are no longer pulling too. Thanks to all who made suggestions esp Dave4x4 who came up with the pipe ID numbering. Which one is which for the front, do you know? (just as a matter of interest)
 

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