Maybe... look at the fees on each. If they're the same then I can't think of a reason to consolidate (or to not consolidate). If they're different then that's the reason.
I've just moved mine from Aviva to Vanguard for the slightly lower fees.
I need to look at mine to see what the costs are of each.
My logic for consolidation was potential cost savings and simply less mental overhead and paperwork on my part. ie. it's one less "annual statement" to bother reading or whatever.
Counter argument is "don't have all your eggs in one basket"
I have three pension pots with Aviva (one current) and two from previous jobs.
Is there any reason to consolidate them?