The clear plastic tube in my Avid Juicy bleed kit that fits on the end of the syringes solidified and are useless. Therefore I need to buy some new ones but am unsure of the diameter and type of tube required. Can probably buy it from a model shop or something.

Anyone know the diameter and type?

you’ll find it in a fish shop (the live one’s in tanks rather than the deep fried or freshly caught varieties)

Or windscreen washer tube from a car accesory shop.

Tried both of the above but diameter was too large. Apparently I need 1.2mm clear hose. Don’t know where on earth I will find it!

Try a hydraulic hose supplier, pirtek is one such national chain.