24/7 Home Rescue is a scam company, stay away. I am very lucky, my credit card company retrieved my money from 24/7 Home Rescue.
Once your boiler breaks down 24/7 Home Rescue will charge you £75 for a visit, even if you have zero excess, then you will get a generic email from 24/7 Home Rescue saying the cost of repairs to your boiler is 60% of the cost of your boiler and to fix it it will be out of your contract. meaning you will pay to have your boiler fixed. Even if your boiler is a few years old & the cost of fixing it is around £70 to £100. That's the scam.
Trustpilot is publishing fake reviews for 24/7 Home Rescue, for a sum of course, and they are hiding the negative reviews. Don't believe me? check Trustpilot for yourself. For every detailed negative review there are six or seven 5* reviews saying "great service" or "very happy". You don't have to be a smart to figure it out.