UK Handling Agents
Hello
Re your query ref Ground Handling Agents, the most common ones found I think at the majority of large UK airports would be -
Penauille-Servisair
Menzies
Flight Support
Individual airports may have their own in-house handling department
That's all I can tell you now
To find out the agent at specific airports across the UK would be a big trawl
Perhaps looking at the airports websites would provide the information that you are seeking
Regards
Vasconav