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If I buy a Big Value Six pack while it's on offer can I activate it in a couple of weeks time once my Big Value Bundle is about to expire OR do I have to use it straight away?
Certainly understand the reason for wanting to get a six pack before the offer ends on the 4th February.
The problem you are going to get is the six pack is valid for 180 days and as soon as you have purchased the pack, you will find it kicking at midnight the same day. There is further information here with all the terms and conditions on a sub link: Big Value Six Pack
However, if you still need clarification, it won't do any harm calling Vodafone or using live chat.