After being with Diamond for 7 years, I was surprised to receive a nice £88 bill/warning from Diamond insurance.
They auto-renewed my policy without my knowledge. They didn't have my payment details, but no problem! They renewed it anyway for 22 days and then canceled it (charging a £50+ cancelation fee).
So... without my knowledge, they renewed my policy, then canceled it, and then charged a cancelation fee hahah!
AND on a side note, watch out because they will try to increase your renewal premiums every year, hoping you won't bother to check. Every year I had to negotiate to get it lowered.
ALSO check out the dodgy 5 star reviews they have here... one mentioned "paying shipping", very weird. Seems like someone is trying to manipulate the rating.