Thanks everyone for the advice. I ended up buying a "Fjell Runner Bumbag" - well I have given it to someone so that they can give it to me for Christmas. Just enough room for what I want. I decided on a bumbag rather than a chest pouch as I am always too hot and covering my chest might have exacerbated the problem - the bumbag will also hide my stomach!
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Pennine Way 2005&2014; C2C 2006; SWCP 2007; WHW 2008; GGW 2008; Dales Way 2011; Clev.W 2012; Yorkshire W.W. 2012; Offa's Dyke 2013; Peddars Way & Norfolk Coast Path 2014; Pembrokeshire Coast Path 2015: LEJoG in stages 2018: Camino 5/2019.