Results and suitability will depend upon the climate amongst other factors. Solar panel requirements include climate, building orientation amongst others.
Building Orientation
Ideally your building should be orientated so that the solar panels can be positioned on a south facing roof. This probably applies more to pitched roofs, as equipment can possibly be orientated as needed on a flat roof.
Appropriate Solar Panel Angle
Solar panel requirements also include the ability to set the angle of the units at about 45 degrees. Your supplier shouldbe able to advise about the ideal measurement.
Planning Consent
Besides technical considerations, in the UK you will probably need to obtain planning permission for solar panels. The exact regulations may vary from place to place and special consideration needs to be given to listed buildings.
Freeholder Permission
If you live in a leasehold flat, for example you should probably talk to the freeholder and management company for their view and permission for your installation.
Summary
There are many aspects to consider when thinking ahead about solar panel requirements and the list above is only intended to give some suggestions you might like to consider. It's probably a good idea to ask on forums and approach solar panel installers for further advice. In a new, growing area such as this, the more information you get the better.