Hi there, I too am a UK qualified Dr who has just arrived in Singapore. In order to work you have to be registered with the SMC. If you qualified at either Cambridge, Edinburgh, Glasgow, Oxford, or London, your qualifications are registrable. If not, you will need to contact the SMC to determine what other requirements are needed ( Silly, I know, as all UK medical degrees are of equal standing!)
However, the SMC also requires a whole myriad of paperwork in addition to all your original certificates, so its worthwhile trying to accumulate all this prior to you coming ( I'm finding it very slow going trying to do it from here).
1. All your original certificates
2. Transcripts of all your examination results for every year of undergraduate medical studies (!)
3. Copies of documentary proof of housemanship training with details on the period spent in each discipline.
4. Certificate of Service working experience for the past 10 years from the supervising Medical Doctors or Institions concerned indicating grade of emplyment, nature of work, period of employmernt and assessment of work performance.
5. Certificates of GMC registration
6. Letter of employment from prospective employer.
In addition, you have to arrange for the following to be sent directly to the SMC
1. Current certificate of Good Standing from the GMC
2. If you are just qualified, a testemonial from the Dean of your Medical School attesting your character
3. Letters of verification from issuing authorities on all post/ undergraduate training.
As you can see , it's a major job just assimilating all this paperwork!
I contacted a lady called Yvonne Yee from the SMC for this info, via the Ministry of Health Webpage. You can also try emailing them directly on moh_smc@moh.gov.sg or calling them on +65 3259068 or +65 325 9015 or fax +65 224 1677.
As you can see, you need to get a job offer before the SMC will process all the rest. You haven't mentioned what your speciality is, but personally speaking as a GP, there has been no problem finding employment opportunities.
So, good luck. If you want any further advice let me know, although I'm pretty new here myself!