Sorry to hear your Jazz was stolen.
Unfortunately, most insurers will only offer market/trade value. They are not known for being generous.
Could be looking around £6.5k (perhaps less) on a 57 plate 1.4SE manual with 8k miles given the current state of the used car market.
I believe this will be their first 'offer', although they won't state this fact.
Through lengthy negotiation, you may be able to get them to raise their offer.
Don't quote me but I had been told (may be a relative who works for an insurer) that some insurers may be able to 'help' and locate a replacement vehicle of similar age/condition on behalf of the policy holder through their motor trade contacts. Policy holder then only pays trade value for the replacement vehicle through the insurer's contacts. ie. cut out the middlemen.