Hi,
we when arrived four years ago it took about 1 week to clear customs. they do not check ALL containers, but actually randomly select. we arrived with another couple (business partner) and we were both selected for inspection so i believe they inspect more than they do not.
we left a lot of stuff in the UK - taking shippers advice of what is not allowed - however my business partner brought absolutely everything and it got through.
the obvious items are of course not to be sent. also ensure all drugs are on prescription and carry the label. check what drugs are not allowed such Coedine etc.
Another tip ensure all education/birth and marriage certificates are attested at the F & C Office and then the UAE Embassy (if UK based)