Three taxpayers each wish to make a BADR claim in relation to a qualifying disposal made during 2023-24. Their previous claims are as follows:

(a) Gemma made a BADR claim in relation to a gain of £600,000 arising in June 2014.

(b) Robin made a BADR claim in relation to a gain of £2,300,000 arising in May 2010.

(c) Joyce made a BADR claim relating to a gain of £750,000 arising in October 2008 and a further BADR claim relating to a gain of £6 million arising in September 2010.

For each of these taxpayers, calculate the remaining amount of the BADR lifetime limit which is available in relation to the qualifying disposal made in 2023-24.