back to the old "what use is TS in IMC anyway" .
So turn right a tad to avoid it!
No. That would be short sighted. You can't see it, why you be guessing how you might avoid it?
The last time I was in the UK I was shown AIC: Y 106/2012
If your flight conditions and/or nature of flight are such that you need advice on how to avoid conflicting aircraft (e.g. flight in IMC and/or where cockpit lookout is constrained) then you should ask ATC radar units for a Deconfliction Service