RE: ISA29 Sep 2017 16:51
To add to the previous post, this is an unusual one. Normally in a corporate action, such as dividend payments, the ex-date comes before the Record date to allow transactions to complete. On this occasion it's the other way round, which I found pretty confusing. You'd normally expect to be able to partake/benefit from a corporate action if you hold on the ex-date. I had a little search around and found this on Barclays...
'In order to determine if you are entitled to participate in a Corporate Action, you must hold the stock with us on Ex date. If you place a purchase after record date but before ex date and this trade is unsettled in the market over the day in which Record date falls, this means that the new outcome (stock or cash) will be delivered to the pre existing broker but the Corporate Actions team will claim the outcome on your behalf.'
From this it would suggest you're ok for for the open offer if you bought today (ex-date is 8am on the 2nd Oct), it's just going to be more work for your broker. However, I would check with your individual broker that this is definitely the case.