simon the viking
Guru
http://www.chainreactioncycles.com/x-tools-bike-tool-kit-18-piece/rp-prod40997
is a good start , or you can buy them individually for a few quid more .
I worked out what i needed from looking at the equipment on my bike and then looking on tinternet and buying the best i could afford. park are good but can be a bit expensive.
decathlon have a reasonable kit too and you could use the list of tools to get u started
That does look a good deal...... he will also need (or would be good idea to get) a maintenance stand either the £30 Aldi/Lidl one or the one @young Ed keeps telling people to buy (i'm sure he's on commission) Link please Ed!