According to this DBS are offering a fee waiver on all stock purchaes for (new?) Treasures customers. Includes UK. Not sure if that's a permanent thing or if it will expire.
Edit: the total amount saved is capped at 10,000 hkd. Their charge for UK stocks is about 25 quid I think, so about 40 trades before you run out of your allowance and need to start paying the fee.
Scroll down to find it.