Wow!! You have got a result if you can insure a group 20 car for around £300 at 24 years of age. What car is it? My son pays over £600 a year on his 2001 Subaru WRX STI and he is over 30.
Before I changed over to Classic car insurance on my 450 bhp 2wd Sapphire I was paying for group 20 fully comp around £650 a year.
Who are you insured with as im sure there will be a lot of younger drivers who will be getting a quote from them.