Dont worry theres a few of us Brits floating around (no pun intended).
You might find that its the low levels of nitrates etc thats aggravating your hair algae. I had a similar issue in my 360L tank. To combat it, I upped my level of CO2, increased my lighting, started dosing the tank with excel and added some siamese algae eaters.
In the space of about two weeks I now have almnost no hair algae and as an added bonus no BBA.
With regards to carpeting I have both dwarf hair grass and lilaepsis. I found that they struggled to form carpets and were prone to picking up debris and algae until i hit close to 2 watts per gallon.
Now they are holding their own and spreading nicely out in their respective areas.
I found the lilaepsis is a a slow grower while it is getting established, and actually reduced the amount i have becuase i wanted something a bit more vigorous.
My tank has directional filter outflow, so i also set things up so that the outflow blows the water comming out of the CO2 membranes straight at the foreground carpet.
I was slightly confused by which lights you have on and which are off, what is the total wattage you are running at the moment?