The most important item.

The Bike - see your other thread

Just make sure it's got a good rear rack with a dog leg, Topeak do a good one for about £25

You will also need 3 bottle cages and the largest bottles you can fit in them

Tools enough to fix a flat tyre, don't bother with spare innertubes etc, you can buy them when you need them

You will also need two good panniers, Ortelieb are best, otherwise get the best you can afford, a bar bag is also required, as it's where you keep all your valuables

The tent (s). You could write books on the subject, ideally you want to look at 2 or 3 man tents by companies such as The North Face, Terra Nova/Wild Country, Mountain Equipment. All of them are great and all of them are expensive.

So your next best option is Army Surplus, the British Army use the Vango Force 10 ridge tent (don't touch the newer dome design of the same name) - They can be got from companies such as Anchor Supplies (they have a web site) by mail order from about £70 last time I looked - they are good solid (and heavy) tents.

Like the bike, you are better off with a good 2nd hand tent rather than a new crap one. - You can not buy a tent worth having for less than £150 new.

Sleeping bag - best you can get (Army Surplus for £20)
A Thermarest
A Stove. A Trangia is good (again Army Surplus)
A good torch which can double up as a front light

Then very few clothes, you will be amazed how little you need.

Two adages when packing

"Every ounce counts" and "If in doubt, leave it out"

You will need to pack and repack before you go, each time cutting down the amount you are taking, 1 pair of trousers, 1 t-shirt, 3 pairs of sox, a jumper, some rain gear, a hat and that is about it.

You will basically spend your time waring your one of your pair of bike shirts and one of your pair of bike shorts, everything else is extra.

Two friends who did your route last summer send a large parcel home after the first week with over half their gear.