After seeing a mention somewhere, I contacted IHG to enquire about the discount.
I received this response from the EMEA Company Secretariat
Dear Mr
Thank you for your email.
Our Shareholder Hotel Discount Promotion is available to all IHG Registered shareholders, regardless of the number of shares they hold. Since it is only available to Registered shareholders, holders via nominee or brokers will not qualify.
If you have further queries, please do not hesitate to contact us.
Kind regards
They failed to answer my question, which was how much discount.
I've contacted my broker, who can't find any mention of a discount but suggested I contact Equiniti.
Does anyone know the rate code so I can do a little research before deciding whether IHG would be a "good" investment?