I'm a newbie (on my 3rd pen now), but I'd say that looks reasonable. I bought all the odds and ends separately and it ended up a little cheaper than that, but not much. In my (very limited) experience, the tube insertion tool is not really necessary, but hey ho.
2 things that aren't included in that are Micromesh (not strictly a neccessity but leave such a nice surface), and some sort of finish (I use the boiled linseed oil and superglue method). There's a good supplier of Micromesh on ebay (search will bring that up - I'm being lazy...), though you may want to combine postage from Stiles and Bates if ordering the other stuff from there - it usually costs about 13-15 quid for the 9 small pads, which are well suited to pens. BLO and Cyanoacrylate (superglue) can both be bought locally.
I found this guide very useful in trying my first pens:
http://www.woodturned.co.uk/html/cutting.html
And details about the BLO/CA finish I mentioned are here:
http://www.woodturned.co.uk/html/blo_ca_finnish.html
I believe the owner of the above site may be a member here, and I hope they don't mind me posting the link, but I found it such a useful guide I think anyone starting with pens should have a look.
I've found pens to be great fun, and quick enough for someone who doesn't get a "workshop pass" often, like me! I'd say go for the set you've found - you won't regret it. Enjoy!