Oxbrige undergrad then Harvard LLM or Oxon BCL is overkill for practice la. Study so much no point because success in practice is usually a combination of proven track record at work and support of internal political factions or key patrons within the firm (for big firms). For small firms, a killer referral network or killer win-loss ratio (for disputes).

Post-grad is more for public service which are credentials-obsessed and you look good with a string of qualifications when you churn out your 100th policy paper for Minister.

If you're looking to be a high flying LSO or civil servant and then for Singapore to push for your nomination as the next WIPO Daren Tang or FATF Raja Kumar then sure by all means collect the post-grad credentials. Otherwise don't bother unless purely out of interest.