I'll tell you 2 stories:
1. My car was parked on a public road in 2020 when it was hit by a TfL bus. I provided the video footage showing clearly how my vehicle was damaged, time, date etc. My car was a complete write-off. Saga investigator was unable to identify the responsible company (how can you find Transport for London in London?) so they deducted the excess and paid the difference.
2. My second car was parked outside my house when it was hit by a Tesco delivery van. Saga made dozens of excuses (it takes a long time to watch the video, they can't find it, they can find it but they can't open it, IT people are not available, they need 2 weeks to investigate etc.). They told me also that they have just one investigator who is off work so I contacted Tesco, obtained the information and passed all that to Saga. Do you think they followed that? Err... I suspect they will not be able to find Tesco either.
So you are wondering whether you should insure your vehicle with Saga? If you are looking to throw your money away and receive shoddy, substandard service, look no further.