Something with a root on would be perfection this time of year but if that proves difficult then a bunch of 10-12 inch sticks with some internodes (even better with tips) in damp tissue at the thick end is fine. Reality is that they're best about feb or june/july but I'm impatient. I used to cut a bunch in feb and just stick them in a jam jar of water on the kitchen windowsill to root ..or just pruned mid summer and stuck bits in pots. About 8/10 rooted and one or two are enough when mature trees for any family.
I searched a long time for pecans. There is a place in the USA that exports cold hardy ones.. but only by the container load!! And they have to go through all sorts of export quarantine. The only place I ever found UK was
http://www.agroforestry.co.uk/plantorders.html But they germinated seeds to order (from cold hardy known stock) and send tiny seedlings in the autumn. About half didn't make the first winter outdoors.. perhaps I should have greenhoused them until a bit bigger.
Most Roses, I find, are hard work - always needing spraying with something although there is a small flowering pinky-white climbing rose on the side of this house that has been bullet-proof. The only rose here. I made a conscious decision not to do flower borders - enough weeding as it is.
I'll PM my address etc and if you send back a postage estimate and email I'll paypal the cost over.
Incientally.. you mentioned no blueberries due to soil type. Back in Surrey I grew them in large tubs of ericaceous compost for that reason - cheap ones from wilkos did well. I also sent my sister a 'set' from
http://www.talatonplants.co.uk/ as a birthday prezzie and she has them in tubs near Reading