New to MTB

Hi, I've recently have taken an interest in MTB and I love it, I have been using a Scott Tigua hardtail is that a good MTB or should I upgrade? I ride on gravel, rooty etc, I have been looking at the Carerra Kraken which is highly rated by what I've read. My budget is around £300-£500, also should I wear a FF helmet?
Bikes:
2013 Mondraker Dune XR - XX1 XO1 Hope, Easton Carbon, Fox
Voodoo Bizango XT - Hope, Pikes, Mavic
2013 Mondraker Dune XR - XX1 XO1 Hope, Easton Carbon, Fox
Voodoo Bizango XT - Hope, Pikes, Mavic
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If you look at the first post by supersonic in beginners section that will help you understand what is available and also what not to buy.
You'll notice the difference with front suspension and disc brakes.
No you don't need a FF helmet.
2013 Mondraker Dune XR - XX1 XO1 Hope, Easton Carbon, Fox
Voodoo Bizango XT - Hope, Pikes, Mavic
He said its for Downhill (type of riding) not riding downhill.
2013 Mondraker Dune XR - XX1 XO1 Hope, Easton Carbon, Fox
Voodoo Bizango XT - Hope, Pikes, Mavic
jeez :roll:
2013 Mondraker Dune XR - XX1 XO1 Hope, Easton Carbon, Fox
Voodoo Bizango XT - Hope, Pikes, Mavic
To ride down you first have to ride up.
Unless you are talking using uplifts, which is neither XC and hardly AM, in which case you are buying the wrong bike to go with the helmet.
There is no secret ingredient - Kung Fu Panda
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Parktools
http://www.gooutdoors.co.uk/calibre-two-two-alloy-hardtail-mountain-bike-p275612
And http://m.evanscycles.com/products/specialized/pitch-sport-2015-650b-mountain-bike-ec070611
Alternatively some of the voodoo or carrera models at Halfords are very good.
My friend bought the speciaized in the link above and managed to smash his front chain ring up on a rock, not sure if it's because the front rings are not very good or just bad luck, but it's a nice bike.
I'd say technique and skill is more important than an ff helmet, an ff helmet won't stop you breaking your neck and/or back if you take a 30ft plunge. The trick is to ride in a way that you wion't take a 300ft plunge in the first place.
If your getting back into it, I'd suggest riding at a sensible speed, especially on downhill sections, and not doing downhill single tracks with 30ft drops to the side until you have built up some experience.
EDIT: Also as mattharrier mentioned, the best way to look at upgrading is to look at your current bike and think about what it doesn't do as well as you'd want, if it's in good working order it might well be that it's the rider that needs to bee improved