Just for information, I ordered my TT-023 on the 27th of March and it arrived yesterday (31st). That's just FOUR days, to the UK (with no additional taxes/duty to pay)
Now I just have to decide whether re-use the 11 speed Di2 parts that can be swapped over from my old rim brake bike, or whether to get a new groupset. I see from the Taipei show that L-TWOO have released a new fully wireless TT brake/shifter! But so far no sign of any of their TT components shipping to UK.