It's not surprising that Mauritius is so desperate to get this deal through.
Can you imagine being Mauritius; a small country, GDP of around $16 billion a year, a population of around 1.3 million, no conventional army, yet despite these limitations, you are able to get the Foreign, Commonwealth & Development Office into agreeing a deal that would see Britain give away their own sovereign territory, while paying for the privilege of doing so, and with this new-found money, you are able to introduce tax cuts that would exempt 80% of your workers paying income tax, all while Britons face the highest tax burden since WW2.
You have quite literally hit the jackpot. And despite the British Government having numerous setback that would allow them to exit this terrible deal, they still try and persist on getting it through.
The Chagos deal, if enacted, would be so beneficial to Mauritius, that they were planning to implement tax cuts that would see 80% of workers exempt from paying income tax.
British taxpayers would quite literally be funding tax cuts for Mauritians.