As I said in the thread last week.
Two things to look for:
Number one importance - make sure that the policy gives you "treatment for life".
In that situation, should your pet develop a long-term illness, the costs will be covered for the life of the pet as long as you keep on paying the premiums.
A lot of policies only cover for 12 months of treatment and then you're paying for any longer-term issues.
Number two - to save yourself money look for Quidco deals.
I insured one of our cats with Sainsbury's last year.
Went for their "top" policy as I got an £80 cashback from Quidco - meaning I only paid around £40 for the whole year.
This is the second time I have seen someone say look for lifetime treatment and then say they are covered with Sainsburys (maybe it was you last time too, cant remember!). An additional word of warning here, as I pointed out on the previous thread - There is two types of cover for lifetime treatment. One will treat for life, up to the policy limit (Sainsburys), one will treat for life, up to the policy limit, every year. So wuth Sainsburys, once you reach payout of £7500 or whatever it is, the payout stops, weather that be 1, 2, 3, 4 years etc. Under the other type, offered by Argos (platinum), Marks and Spencers, PetPlan (I think, but not 100%) and a couple of others, it will be the upper limit every year for life, so if treatment was needed for three years with a cost of £7500 per year, these would pay out £22,500, whereas Sainsburys (and similar policies) would pay out £7500 in the first year, then you would have to pay the second and third (in reality you would have your pet put down).
Its OK if the costs are only say £500 a year, then sainsburys would pay out for 15 years (assuming £7500 cover limit), but aware of the actualy wording of the policies, not just the claims of lifetime cover.