The short answer is no, if you only have a cbt you are
restricted to 125cc with L plates. The 33hp limit applys if you
take and pass your full test on a 125cc bike, after 2 years it
automatically becomes an unlimited licence.
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One can purchase a CBT Nugget on a couple of websites online.
CBT Nuggets's official website allows users to purchase a CBT
Nugget on their website for a reasonably low price.
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The letters cbt stand for Cognitive behavioral therapy. Its more
of a Abbreviation