Job Done...easy enough..drained and refilled with tap water. Let in run till fan kicked in twice and then drained and re filled with tap water again. Same process.

Filled with 50/50 mix with the manual stated level of 1 litre in the radiator and 0.25 litre in the coolant res.
Ran it up till fan kicked in and left it till the morning.

Different amounts given in various posts to those in manual.

Any ideas?