Michael,
I don't believe any of the Police EC135s, MD902 or AS355s have weather radar (Not sure on the Bond machines?). I believe the Met EC145s, Devon and Cornwall's BK117 and Dyfed Powys 109 all have it.
That front last night was quite exciting. I went into the IOM just before it and generally the cloud base and visibility was good out of the showers. There were lots of CBs around but they were easy to avoid on the weather radar. Another aircraft followed me in as the front was on us and they reported the same. They also had 74kts of wind on finals.
The only problem with helicopters in wind is starting and stopping the rotors, most medium helicopters have a limit of 50kts. This can be reduced if you shutdown in the lee of a hangar.
FNW