Personally I don't think insurance is worth the bother & expense - certainly when I made some enquiries about insuring my collection a while ago, the premiums quoted were exorbitant.
Your vase is not in opalescent glass and is almost certainly a post-war example, therefore, to collectors it may be a less desirable example. Barolac is quite difficult to value, the fact that many patterns have remained in production for some time means that collectors often only seek out opalescent pieces or pieces in unusual colourways. Having said that, however, your vase is still an attractive and nice quality piece, my advice would be to use it and enjoy it.
I know many people are reluctant to give values here, however, I can say that as a collector of Barolac I would expect to pay around the Â£50 mark for a vase like yours, possibly a little more if the condition is perfect. As a comparison though, I have paid as little as Â£40 for opalescent examples, while the best opalescent examples sell for in excess of Â£200. Please remember though that I am a something of a cheapskate, many dealers try to charge a lot more....