Last year:
2021-22 ~£140 Fully comp with legal & no NCB
Comparison website today:
2022-23 ~£275 Fully comp with legal & 1yr NCB (some over £1000!)

Just to compare, I also got a quote for a 2007 Triumph Bonneville (900cc) - just £115!

Any thoughts, why is the MP3 apparently now attracting these high insurance premiums in the UK?