there is loads of info on the internet on the best aspect to choose. have been given to understand that best aspect is west or south west. would it be possible to put them in garden facing best way. a difficult to garden bank or some such?
If you don't have any idea, you can check Mr Renewables, they can enlighten and teach you about it. They will also guide you if you want a DIY solar panels. Check them http://www.mrrenewables.co.uk/solar-panels.html