It does seem pretty good but why not shop around just for peace of mind? Personally, with an older car I'd go 3rd Party, Fire and Theft but obviously that's up to yourself.
Ive max no claims and mine was 350 on an 04 Honda Civic and they are apparently "loaded", or so an insurance company told me last year when it went up by 300 euro from previous car.
I would shop around. My best quotes were eagle star and sertus.
I paid €270 (last month) for fully comp me(30) and husband(33) for a 99 opel astra. No pen points for either of us and I've 6 years no claims. But I'm also on the last year of a Hibernian Ignition discount of 40%. Without that my renewal would be about €360 although I could have got €300 with RSA - maybe try them.
You haven't mentioned how old you are, if you're under 30 it could be a factor.