Hi can someone shed some light for me pls i passed my part 2 test in 1997 on a 100cc bike which has given me an a1 licence now am i restricted to a 125 or can i ride anything as long as its restricted to 33hp or what ever it states and help here would be grear thanks

Late reply but: http://www.direct.gov.uk/en/Motoring/LearnerAndNewDrivers/RidingMotorcyclesAndMopeds/DG_4022568

Looks like if the test was passed on a 100cc bike you're restricted to a maximum of 125cc. To ride any bike you must do the test on at least 120-125cc then wait the obligatory 2 years/age restriction, or do the test on a 500cc as per the above link.