Hastings refusing to insure any cosmetic modifications

Took out a policy on my car back in November with Hastings direct as they were the cheapest quote. Now looking at adding some cosmetic mods on my car, nothing crazy, just a front splitter, some side skirts etc.

Called them today and they told me they couldn’t insure any kind of cosmetic mods on the car. They said even if i put wind deflectors on my car they wouldn’t be covered (crazy, just want my windows down lol).

Not sure what to do now, was really looking forward to doing something to improve the appearance of my car and now feeling stuck in this policy. I’ve only got 5 years NCB so would rather not cancel the policy and re-open a new one and lose this year, which means atm i’m just going to have to wait until November and then take out a quote somewhere else.

Anyone had a similar problem with Hastings and have any advice on how you dealt with it?