Helen Brennan, sandwich product developer for M&S, said: "The news that Harry got down on one knee to pop the question over a [meal of] roast chicken captured the hearts of the nation and inspired the M&S sandwich team to create a limited edition rebrand of one of the nation's favourite sarnies."
A release from the retailer went on to say that following "some confusion as to whether public guests attending the Royal Wedding will be offered refreshments on the day" - it turns out they will be offered some snacks - M&S has said that anyone presenting their invite in store on Friday or Saturday can receive a free meal deal.
The Proposal will be available in all M&S stores across the UK from 16 to 27 May. No agency is involved in the activation.
The wedding takes place in Windsor on Saturday 19 May.