Cheers for the reply I hope it's a good bike only paid £200
It is quite old so might have had a bit of use. You can do a few basic checks yourself so you don't have problems.
Hold the front brake on and push the handlebars to and fro. Any play felt here may indicate worn head bearings or adjustment.
Spin the wheels to see if they are true and listen for any noise from the hubs. Pushng the rims side to side will expose any bearing play too. Are spokes tight?
Push the cranks from side to side, anything more than slight play may be wear.
Check the brake blocks are in good condition and brake operation is sharp and the lever doesn't come back too far. I'd always change the cables, the inners at least, on any older bike new to me.
Do the gears shift cleanly and easily?
Check the tyres for signs of perishing and wear.
Good luck and enjoy.