Solar panel manufacturers: read those data-sheets
Here is a list of solar panel manufacturers, together with solar inverter manufacturers.
All of these companies sell their products in the UK, usually via wholesalers.
If you decide to go ahead with a solar panel system, your installer will buy the panels and the inverter from wholesalers they work with.
If you have any questions about panels or inverters and feel you can’t get enough information from the installer, contact the manufacturer direct.