Congratulations on your admission to Booth London! It is a great program, and the 25k scholarship is a significant award.
As for whether it is the best program for you, that depends on your specific goals and needs. If you are looking to transition out of a specialist role and pursue a career on the FO side, then Booth London is a good option. The program has a strong focus on finance, and the alumni network is well-connected in the London financial markets.
However, there are other good programs out there as well. Wharton Global, LBS, and Columbia are all excellent schools, and they may be a better fit for your specific goals. If you are not sure which program is right for you, I recommend that you speak to current students and alumni from each school.
As for your employer, it is definitely worth having a frank conversation with HR. Explain your goals and why you believe an MBA is the best way to achieve them. Ask them what kind of roles they would be able to offer you after you graduate. If they are supportive of your MBA plans, they may be willing to offer you some financial assistance.
Ultimately, the decision of whether or not to pursue an MBA is a personal one. You need to weigh the costs and benefits carefully, and make sure that it is the right decision for your career.