I work for a very well known insurance company. I've worked there over 12 years.
The rise in insurance prices in the past couple years is absolutely NOT something companies want to be doing. There's lots of different factors that cause premiums to change, including, your area, claims in your area, crimes in your area, your own personal risk, have you made a Claim, what's the value of your claim, the cost and impact of fraudulent claims, how the business is doing, are you in a Flood risk area, has there been adverse weather in your area, has your property have subsidence, have you added any items of a particular value (do these items still need specifying) amongst maaannnyy other factors.
I'm also a customer of insurance, I get it. The best thing you can do ahead of a renewal is shop around before accepting any quote. A lot of companies will meet your new quote.
If you're finding a premium which is significantly below yours, there's normally a reason. Check your policy, check the exclusions and endorsements, check the limits, check your excess and make sure it doesn't change depending on the cause of damage. I would also HIGHLY recommend checking customer feedback for the company if it's an unknown company. Trust me, if you're claiming for something that involves your home you will want the best service.
Don't just take out insurance because it's cheaper, make sure it's offering you what you want and need.
Hope that helps.