What bike is this? And is it worth £25?

Just need a cheap second hand bike to mess around with friends with at the park and stuff... My friend is offering me this for £25
http://i48.tinypic.com/14d3kev.jpg
What bike is it? Brand? Model? He doesnt know either cause he's a noob. Anyone give me any idea of the dimensions of this? i'm 6'1
I know it's no amazing bike but it could do the job,
Keep in mind the tyres look pretty flat. How much do you think its worth?
ALSO: what are the UK laws about riding a bike without a helmet nowadays?
Many thanks
http://i48.tinypic.com/14d3kev.jpg
What bike is it? Brand? Model? He doesnt know either cause he's a noob. Anyone give me any idea of the dimensions of this? i'm 6'1
I know it's no amazing bike but it could do the job,
Keep in mind the tyres look pretty flat. How much do you think its worth?
ALSO: what are the UK laws about riding a bike without a helmet nowadays?
Many thanks
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VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
I used to hit my knees on the bars test riding them round the shop & couldn't raise the saddle high enough either, I'm 5'9".
It is a generic full suspension bike, made for lots of different brands using the heaviest steel available to man with the worst components known in the universe, hell even the inner tubes don't seem to want to hold air in them
In short, I wouldn't waste the cash.
That being said, I see loads of them (well, that sort of bike) on my morning commute. So they must be passabe.
As for helmet laws. Afaik, there is no current uk legislation to compel you to wear a helmet. But you'd have to be a proper spanner not to, especially if riding off-road.
*awaits inevitable anti-helmet brigade responses*
F*cking Fast 29er
Rapid Rose Roady
Bionicon Beast
Rockhopper Communter
Cube Ltd Race
I would look for a hard tail for the same money if i were you, the rear sus is just not worth the hasel on these.