Hi Ma'am,
1. Dubai PCC: It's called the "Good Conduct Certificate" in Dubai. For obtaining which u have to visit the nearest Dubai Police Stn and apply for it. Previously they used to dole-it-out 'only' from the CID-DPGHQ office -- but nowadays it could be applied & received from ANY POLICE STN. There's a fee of AED110; and u receive it in [usually] 7-10 days. Here's the link for procedure [just ignore that DPGHQ thing there]:
http://dubai.ae/en/Lists/HowToGuide/DispForm.aspx?ID=30
2. UK PCC: Can 'only' be applied thru APCO offices in London. It takes around 10-15 days to receive it. Here's the CIC guideline for it:
http://www.cic.gc.ca/english/information/security/police-cert/europe/united-kingdom.asp
3. Indian PCC: U can obtain it from CONGENDIA offices around the globe. U got to visit their nearest office@the country of ur residence [in ur case Bur-Dubai]. Costs AED40, if ur pp is issued in Dubai - u get it in 2-4 days max, however if ur pp is an Indian city issued - it could take 4-6 weeks. U just need to take ur original pps, fill-up a form & pay the fees. Unfortunately their website is quite about the process [http://www.cgidubai.com/?p=39], however here's the CIC link to it:
http://www.cic.gc.ca/english/information/security/police-cert/asia-pacific/india.asp
Hope that helped.
Qorax