This is a favourite topic. We deal with double taxation claims from India, Australia, Vietnam, South Korea, Russia, Kazakhstan, Azerbaijan, Angola, Congo, Nigeria, Libya, Algeria, Denmark, Norway and many more. In essence the principles are the same. Some of the double taxation treaties are quirky. Fortunately the UK has a catch all which essentially unilaterally recognises foreign taxes paid.
The fundamental is one of matching. Foreign tax credits can be applied to the same income that has been taxed in the UK. Mismatches cause problems. Foreign tax paid on your behalf is a benefit. If your employer operates the Net of Foreign Tax Credit Scheme, then you won't be able to access a UK rebate.
There are lots of issues to address. Provide us with the facts and we advise as to whether a rebate is available.