First thing Martyn is to try remain positive…. I have been in a similar situation and I always find the weekends much worse. In my younger days Soi Cowboy etc may well have provided some entertainment as did solo sightseeing, but those days are long behind me.
I recently purchased a Samsung tablet and installed skype – this allows me to speak to my kids (and see them at the same time via the built in camera) without running up huge bills.
I also find that loading it with classic episodes of Python, Milligan and recently, ‘It aint half hot mum (with Michael Bates)’ puts a smile back on my face.