Check the wires mate. Theres a big black wire going from the battery to the starter motor, and then the red from battery to starter relay. Check the wires themself, and also look for corrotion and crud where they're mounted.

It might be the startermotor itself, could be worn brushes and/or worn commutator (the "shaft" on the startermotor itself)

Just how long does the motor have to turn over to start ? It should only take a few seconds to fire off if the carb is clean and jetted good . If the motor is turning over slow even with a new battery it will take much longer. When these starters go bad you'll usually hear a loud grinding or whining/screeching coming from it . Corroded cables will cause it to labor and crank slow.

Started first button this mornin. Ran it 5 miles..then laid uo fur around 5 hrs...started again no bother..then stopped on n off over a 40 mile run...started no bother..feel a bit happier...cheers guys

Started first button this mornin again..started on the choke...then choke off. N it fires uo no prob...doesnt tick over till its warm.but happy its startin..

The new battery just needed to be fully charged ?

Nearly never started today... but i got it goin..done 150 mile round trip..stopped n started fine..ad say the batterys fully charged by now.