I would suspect apart from regular littering that most flytipping is by people paid to take people's rubbish away (tradesmen, skip hire co's)
Tradesmen dumping microwaves and old tyres?? Utter tosh!
Skip hire companies?? Erm, don't they charge a hefty sum for provision of a skip and subsequent disposal (including landfill tax). Wouldn't they get slammed if they dumped 4 tonnes of rubbish by the roadside? Do you ever see such quantities of waste in one spot? No!
How often do you see building waste at the side of the road? Almost never in my experience.
The people who charge to take your rubbish away are often of no fixed address and allegedly "travelling". I have a different name for these people, but using this is now deemed racist (which it is NOT). Nuff said!
It's easy enough to blame councils (well I grant you, many of them are useless), but the main issue is Brussels issuing directives pertaining to lanfill/recycling. The councils adhere to these because they are terrified of getting sued. Or maybe councils have nothing else to keep themselves occupied with.
Time we got out of the EU, or maybe our government should ignore the Brussels Europrat nonsense!