I can't believe my car insurance has risen by that much!

Not sure which thread to put this on but this seemed as appropriate as any. I have just turned 80 and hope to continue driving, at least for this year. I knew my insurance was due for renewal end of this month so checked on my current insurance site online. It's gone up by an extra £240. Why? OK, I know prices go up annually and suspected there might be an age penalty, but £240's worth? Can anyone recommend an insurance company that deals with older drivers? My daughter tells me there are companies and I am hoping someone here has availed of their services and can recommend. I need the car to transport my husband to various appointments.