Hi,
You can readily get smoking chips on t'internet, but I fancied having a go with some properly big chunks of different woods.
In Steve's signature, I saw that he is sponsored by http://bbqsmokingwood.co.uk/
Well, I contacted Paul via his website & arranged to meet up with him to take away a few different wood chunks to try.
Really nice guy & very helpful - if you can meet up with him, do so. If not he will post out boxes to your requirements.
I came away with a box with lots of oak (which he recommended as most people use this the most), but with a whole bunch of others to try too. Plus some smoking planks & a pot of alder chips to try: