Don't they fly IFR in IMC without radar separation in the UK all the time?

We fily IFR in IMC here in the states all the time. We need to be in contact
with ATC, who clears out a section of airspace for us until we report the next
checkpoint, and clears out the next section ahead of us, all depending on our
position reports but coordinated on the ground. Radar is used in congested
areas (like the entire East coast) but it is not necessary for legal IFR in
IMC.

Jose

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