I live in outlying territory which is worked every 18 months to 2 years so I rarely see them in my road. That being said I have heard of one cart being set up in an adjacent village and have seen one in Fareham once. I haven't seen people out on the door to door work for a long time now nor have I seen the local elder doing his calls on a Saturday morning which was a regular sight as I went out walking the dog.
It is just my impression that they are less active in this area than they have been. But weekend service was always poorly attended here and there is only 1 midweek service arrangement over this side of the territory so it is unsurprising that I see less of them. After all I don't drive round the territory on a Wednesday morning hunting witnesses.