Using terms like "British Airspace" is unhelpful.
Have the Bears flown within the UK FIR? Certainly, there is nothing to stop them doing so, and they have been doing that for 40+ years.
Have they penetrated UK Territorial Airspace? Not as far as we know, unless you know something different.
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tankertrashnav Clearly you don't know anything about UK airspace and classes of airspace and the ICAO rules for entering such airspace. Neither have you read the UK AiP.