From the Bristow website...
At least two hundred and fifty (250) hours on type except where previous glass cockpit experience can be demonstrated in which case this requirement may be reduced but will never be below one hundred (100) flying hours on type.
This is going to be a problem for many, not just the MilSAR guys. Although there are a fair few captains currently flying crew-change who may have the 500 hrs previous SAR experience, most will be operating the EC225 / AS332 L/L2. The S92 presence is increasing but it's still the minority on the North Sea. And as for the AW189....