The UK Government define financial sanctions as 'restrictions put in place that limit the provision of certain financial services or restrict access to financial markets, funds and economic resources in order to achieve a specific foreign policy or national security objective.'
Most financial sanctions applicable in the UK are made via EU regulations (some come via the UN to the EU). This means, at present, they have direct legal impact in UK law. (This arrangement will doubt be reviewed as part of terms around the UK's exit from the EU, but the assumption is the UK will continue to mirror EU sanctions at least in the short to medium term.)
The UK can implement its own domestic sanctions under certain pieces of counter terrorism legislation (Terrorist Asset Freezing act 2010, Counter Terrorism Act 2008, Anti-Terrorism, Crime and Security Act 2001).
Certain U.S. regulations have extra-territorial reach ("Secondary Sanctions") and importantly all US nationals, wherever resident, always have a primary obligation to comply with U.S. Sanctions Regulations. Consequently, the BidCarbon Foundation's policy is to allow US persons to recuse themselves from any strategic decisions (e.g. plan to increase student recruitment from regions subject to sanctions) or direct involvement or activity with sanctioned countries/regions (e.g. payment processing, research partnerships or alliances with institutions, etc.) that is not either generally or specifically licensed. This may also extend to US goods, such as research material that has been produced in the US but which could potentially be prohibited by US sanctions from being provided to certain countries/regions.