Congratulations on the job offer. I had my certificates attested last month so can guide you through the main steps.

1. You need to have your certificate notorised. It will cost you about £60+ vat per document. They will take a photocopy of the certificate and certify that it is a true copy of the original
2. You then need to take this to the Foreign & Commonwealth Office at Trafalgar Square (opening hrs 09:00 to 15:30) and they will confirm that the signature of the notary is genuine. They attach an apostille to the back of the notary's letter and stamp it!!It cost £27 per document. No appointment is necessary and this process can also be done by post (see their wesite for further details)
3. Finally, take everything to the UAE embassy (48 Princes Gate) and they will legalise it for you. £20 per document (ready for collection in 3 days) or £30 per document if you want it on the same day. Be prepared for the queue!!! No appointment necessary! Please note that they only legalise documents issued in the UK!!! I believe that you can also ask them to post the documents back to you!

Be aware that you need to carry steps 1-3 for each document separately, else if you batch your docs, i.e 1 letter from notary for abour 2+ docs, the UAE embassy will refuse to legalise them and you will end up spending more money getting everything done properly. Most notaries will quite happily advise you of the required steps that you need to take for the UAE. They will also get all this done for you at a cost of about £90 - 100 + vat. Pricey but if you are pressed for time, it will save you the hassle of doing all the running around yourself!! I personally did it all by myself and had no trouble.