Ericacious & horse muck !

What a good question Hyde66art, i'll be interested to hear what's said.

I would think it okay but i have no real knowledge on soils and what may affect their acidity/alkalinity.

Seaburngirl would know along with many others Im sure but she springs to mind first as shes been trained in scientific things,if that makes sense hehe

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at a guess I would also say it would be fine as its well rotted, but something springs to mind about the "nitrogen" or something beginning with N that i would query

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I can't think of a reason why you shouldn't, but more importantly, what are you using it on? The ericaceous compost will provide quite a lot of acid, and I have a sneaky feeling that composted horse manure might be acidic too, so unless you're using the mix in a soil with acid loving plants, I'm not sure what the results would be for non acid lovers.

Should be alright for starters or hors d'oeuvres.

thanks for the vote of confidence mookins xxx
as long as it is well rotted it will add structure to the compost and plenty of nutrients. it shouldnt affect the acidity either as most composted material ends up being neutral ie neither acidic or alkaline. [very acidic leaves such as oak and beech that have a lot of tannic acid in them make an acidic leafmould that i use on those plants that need an acidic mulch like the camelia. draw breath sorry about that long sentence :o)]
urine from mammals can be either acidic or alkaline depending on the pH of the blood chemistry at the time.

It should be ok to mix it together ive done it , and had no problems.. Good luck

Thank you all :-)
That is very helpful indeed ! I just needed to check before I added the horse muck to the garden. We have separate beds for different soil types, but it's easier to just throw the stuff around ....