What equipment do i need to start a hobby in landscape photography? I only have a current budget of £800?

You could easily find 35mm equipment in your price range or you could look for used medium or large format equipment. The larger the format in landscape the better since landscapes are best viewed as large high resolution prints. For the same reason, large formats like 4X5 are even better.
If you have a good grasp of camera and lens quality and functions eBay has the widest selection. If you need pro help, B&H Photo online is a good source. Check all the local shops, London has several used dealers.
Search for landscape photographers and look at what they are using.

Velbon Tripod CX440

Go second hand and film rather than digital to start with – its cheaper.

You can pick up some incredible SLR film camera’s very cheaply now as everyone rushes to convert to digital. With them you can get some bargain quality lenses (screw thread rather than bayonet fittings will be cheaper again if they will fit on the camera body).

I read once that a 35mm film camera has an equivalent resolution of about 15 mega pixel pixel digital camera, more for larger format film camera that you might want for landscape photography. Best digital camera’s are getting to 12mp but they cost £££££

You will learn so much more with film camera and the more manual settings the better and more control you will have. There is also less chance of batteries dieing after a 4 hour trek before dawn to get a landscape you want with film.

Pick a make of camera that you can upgrade to a decent digital body later so that you can re-use the lenses for either camera.

If your budget will allow, a good body, perhaps £250 second hand will get you something special, get quality lenses for the rest, a fixed length wide angle will be a good starting point. Last £100 you will need tripod and bag to carry it all in as well as films to start you off. Try a mix of black and white and colour,

Depends how far you want to go but with film you might like to try going in the dark room and printing them yourself to have control over the whole process (black and white is easiest)

Nikon D40: £347.53

http://www.amazon.co.uk/Nikon-D40-Digital-SLR-Camera/dp/B000KIX65S

12-24 mm zoom lens: £624.69
http://www.amazon.co.uk/Nikon-Zoom-Nikkor-12-24-If-Ed-Focus/dp/B000092M1T

A bit over your budget.

If you substitute the Tokina 12-24 mm lens, you will be well within your budget £346.43
http://www.photosolution.co.uk/tokina-12-24mm-f4-nikon-fit-p-216.html

To produce the absolutely best landscapes, you may want to buy a good used Sinar 4×5 view camera with a 65 mm wide angle lens and sturdy tripod

The best digital cameras are medium format and capable of 30 megapixel. You’re budget will get you laughed out of the store though (they run Imperial $30,000.00 – about £20539.50 to be factual).

Film is not really cheaper than Digital however. I shoot both and with processing, film costs and the need to scan (scanner) the slides (or film)… you could save a bundle in the interim by using digital.

The problem is that you need a good wide angle lens to go with your digital camera in order to shoot landscapes. That alone may take up your budget. Don’t skimp on lens quality… that is what makes the image – not the camera… crap in, crap out.

Always start with the glass and work your way back to a good camera.

As I am only here to try and help, and not to promote my own business,and fully understand about photography on a budget, you can do it for about £250, plus extra for another lens, Photoshop or Elements, a decent Tripod and remote release. and filters, so you may be looking at £500 max, all without a nasty nikon d40 in sight.

http://www.srsmicrosystems.co.uk/2043/Pentax-K100D-Super-Digital-SLR-Camera-Body—Pentax-18-55mm-lens.html

http://www.jessops.com/online.store/categories/products/Pentax/50-200mm%20f4-5.6%20DA%20ED%20Lens-32720/Show.html

Take pictures in ‘portrait mode’ whilst on the tripod, taking 6, 7, or 8 shots to cover an area, then ‘stitch’ them together.
You get a much better pano taking pics in portrait mode, than in landscape. More DOF and more to see in the view.

Also, when you want to upgrade the camera, you already have a decent lens to go with it, the 50-200 zoom.

For landscape photography, the "correct" tool is something along the lines of a 4×5" field camera. The reason for this is because large format offers tremendous details, tonality, camera movements, and better processing possibilities. eBay would be a good place to start looking. Film is not too expensive, and chemicals are cheap, too.

You might consider looking here for some ideas on the price:

http://www.bhphotovideo.com/c/shop/3124/Cameras_Lenses_Cameras.html