small/medium
The Blurs all measure up slightly different (XC/TR/LT) so best bet is to at least sling your leg over them, can’t be that hard to find a dealer and organise some test rides (SC UK site has a list of all their std demo bikes and locations) most LBS will be able to organise a test bike from SC if your going to buy from them. If not hit a demo weekend (listed on site too)
Going to head to Melbourne so the missus can try a TRC soon as need to get the sizing right at the price!! She’s about your height but varies so much with reach, inside leg and personal pref!!
Just go try it and buy from where you try if they are helpful!