It's a UK bank as in, it's registered in the UK, but it has absolutely no links with HSBC in Malaysia. Meaning that, you need to open a completely new account here regardless of you having a Malaysian HSBC acc. The british are quite anal about who can and cannot open an account.
3 months? Easiest is to bring a shet-load of cash/bank draft here and the extras can be topped up with withdrawals with your malaysian ATM card.