This is a very good offer from Aviva for the plan in question, Health plan 16.1, it ticks all the boxes, so you won't do better with Aviva.
The plan you had picked out for the children Level 2 Family Health 299 per child, would be the one I would pick with Aviva. It covers all hospital levels with lower excess for private admissions.
Aviva plans in general tend to be on the more expensive side, so to get a corporate rate is a big plus. At the end of the day, its whatever
company you're happy to go with, or whatever you're used to. There is also the option to choose 2 different companies if it was worth it.
Finally, as a last option, its a long shot maybe worth trying.
VHI have a very attractive half price kids offer, with effect from 1 January 2016. One Plan Complete 151 per child, no hospital excesses, 3 levels of hospitals covered, well worth considering.
The corporate plan PMI 41 15; price 1152 per adult, is very similar to Health Plan 16.1.
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The thing about it is, the half price children's offer does not match your renewal date, but it is within days. It would be worth a try, if you
wanted to see if they would allow it as a concession. Overall family price would be 2600.
Otherwise the Aviva offer is a good one, back to square one.
Regards, Snowyb