Depending what you want to grow in the tub I'd just revitalise it with addition of general fertiliser, like Growmore, Blood, fish & bone, chicken poo pellets, Vitax Q4 etc

Failing that just spread it as a top dressing on any border / flower patch

I usually add it to the soil in the borders, just as a top dressing and the worms soon incorporate it.

Thanks guys, that will do nicely.

Make sure there are no vine weevil grubs in it. If you see any white grubs, spread the compost out somewhere & the birds will polish them all off for you.

Thanks F, will check it out.