Hopefully the weather will have sorted itself out by then, they are promising better weather in late May/June but perhaps it will be a bit earlier. The paths may still be a bit "wet"! Are you camping or B&B? I'll be off finishing the last bit of Lejog that a day or so after you start your C2C.
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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.