Question Author
Thanks for your answers - a few clarifications:
Twenty20: I spend most of my time at my holiday mobile home, as my work and small holding are within 3 miles of it, whereas my home address is 15 miles away. I need to tend to the animals twice a day at least, with work in the middle and so I usually only go home once a week, but like to access my post more often than that.
boxtops: I understand that they will only deliver to the sorting office nearest to my address, which wouldn't help me, as I would still need to drive over and would then also have the added worry of parking and opening times.
Eddie51: I understand what you say but how do you go about getting an actual address with a post code - there are lots of businesses that have post delivered that are not residential addresses. E.G. nurseries, warehouses etc. I know that I am not using the land as a business yet, but wondered if I could do the same. I do have a phone line connected and the occasional marketing letter comes from BT. The postman has worked out it's mine and tucks it into the gate, but I would like to make it an 'official' address and have all mail forwarded there.
argorstran: That sounds a good potential solution, if I can't use my land. Thanks for that.
Again thanks for all your help so far.