Speed limits wrong

Elvistheking Registered Users Posts: 4
Master Traveler
500 GO
Even when I update my tomtom the speed limits are mostly incorrect, ie London streets of 20mph still showing 30mph, Urban roads that are 40 mph on the tomtom but actually 30mph.
Theses road speed limits changed at least 2- 3 years ago.
Why is tomtom so slow to up date these?
I know you can report them to tomtom but I would spent my life reporting every single one everyday.