I am about to receive 2,000 GBP from UK. What's the best way to minimize the forex/transaction fees? Is it (a) to deposit 2,000 GBP at source currency via DBS's MCA and subsequently convert to SGD or (b) receive the money as SGD?

Transferwise is the best, safe, cheap and fast.

CurrencyFair maybe second.​​​

I would recommend using Transferwise or equivalent. They are transparent, fast and competitive rates.

I did the former thinking the pound will strengthen. Still waiting! The former doesn't incur any costs. Make sure that they specifically state remitting in Sterling Pounds though in the advice.

I think that might be a possible option. You convert the amount you need via DBS MCA. Additionally, you can also turn on your notification to look out for favourable exchange rates. Can read more here: https://dollarsandsense.sg/studying-overseas-heres-applying-multi-currency-account-makes-financial-sense/

There are other ways to minimise the forex fees, i.e. using Transferwise or WorldFirst- but that will require you to set up an account with them. Quite troublesome. If it's a one-off transfer, I would suggest using DBS MCA instead.