There is no CAA minimum requirement, and no legislation with regards to this with the exception to have the differences signed off.
The TB10 has a variable pitch propeller, which means that you need the VP differences signed off by an FI or CRI to legally fly the plane.
Depending on previous experience and ability, this may only be a 1 hour checkout flight, or may require a few hours of training to get used to the differences. Any experienced FI / CRI will know when you are ready to fly without anyone else.
Any other suggested hour minima will be related to insurance requirements.
Hope this helps!