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Probably quite a few.
Although worth pointing out that the majority of Oligarchs escaping arrest and asset seasure came over in the Blair years. Given the huge wave of legislation created under that government and Brown's tight control on the financial structures, it is remarkable so little was done to tackle the cleaning of money from the former USSR.
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https://www.henleyglobal.com/residence-united-kingdom-res-cit/
The Tories brought in two new 'investment'/timescale levels to the Tier 1 visa in 2011.
https://www.theguardian.com/uk-news/2018/mar/28/may-considers-banning-city-of-london-from-selling-russian-debt
Only considers?
Just how many Russians who have bought UK passports for £2M have donated to the Tory party.