Yep, it's the FWD 184 TDI.Is yours front wheel drive? Mine is doing the same in similar conditions.
Have you thought about getting a DTUK box? Tempted for bit more power but what will it do to the fuel consumption?
I'm not going down the modding route with this car as I'd rather keep the warranty intact!
Starting to see 60mpg on a regular basis now on my commute which is nice...