
To be honest, that doesn't surprise me. Frenchies will be high on the list for expensive breeds to insure because of their health issues.
That said; my dobermann (also a costly breed) is around £30 a month with Legal & General, and £50+ anywhere else. Decent cover with L&G too. So it's worth shopping around and make sure you don't just rely on comparison sites!
Avoid E&L (and anyone underwritten by them) and Animal Friends. Petplan is the best really, but I know it can be too costly despite the value for money. They wanted nearly £80 a month just for my dobe.