Water drain down

Winter drain down? 

dont know what flow is or costs, my solution, open drain tap under front bunk and all internal taps, wind down jockey wheel, go have a coffe, return, close all taps, job done.  some say leave taps to sinks etc open, never have and never had a problem.

One of these .... https://www.ebay.co.uk/itm/123443309954

But I do similar to you, but without the coffee 

What you have done only drains the boiler there is still water in the pipes which can freeze what Floe does is puts pressure in the pipes to empty them

I put my head in the sink and blow in tap so no flow just plenty of blow

sorry.....you are referring to central heating via a Combi boiler, i only have blown air central heating, water tank only supplies the taps

Beside the boiler drain point my hot and cold pipes also have a drain tap. Just open them up and open the sink taps, job done. Just as MM and Rufs posted.

I could get the OH to blow down the sink tap but don’t want to damage the pipework.