At the weekend I managed to take a wrong road on route so I reversed into a farm gateway, well tried too and the car felt really strange, it was as if something was trying to stop it, I suppose a little bit like having a really good handbrake still on, it hadn't happened before but it has happened twice since then.. Again when I reverse out of our garden to the left the car feels like the brakes are on and slightly juddery almost chopping if that makes any sense at all, it actually feels like its coming from the N/S front? I do have a noisy box when I'm doing slow speeds in 3rd and 4th but it still pulls strongly with no issues through all the gears, just thought I'd mention that in case the two are connected.

I have asked on our local forum but only one guy answered, he suggested maybe the diff, would like to get another couple of opinions ..
Thanks Julie