The highest end ! (whether required or not, I always mount radiators with the vent end fractionally higher then the other end)
Flow and return connections are usually pre-determined by pipe runs. As you are only venting air when the system is not running it makes no difference.
You need to change your regional settings on your PC, as your PC thinks it is in the US.
Start, Control Panel, Regional and Language Options Change the drop down box under the "Regional Options" to English (United Kingdom)
Change the Location to United Kingdom
Under the Languages tab, click Details and make sure your keyboard is set to UK (Assuming it is a UK one with a £ on the number 3)
Under the advanced tab, change the drop down to English (United Kingdom)
Double click on the clock, usually in the bottom right of the screen Click the Time Zone in this screen, and make sure it is set to GMT Then click Apply Then click on the Date & Time tab, and set the date and time if it is now wrong.
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