Nissan Terrano 2.7 TDI won t fire?

I have a 1998 ford maverick 2.7 TDI. Which is essentially a Nissan terrano 2. So the other day it just decided to stop working and wouldn t start. It was working perfectly and I stopped somewhere for 2 hours and when I a me to start it it wouldn t. I attenpted to bump start it and also to jump it off a friends car but no luck. I took it home and trickle charged it over night and the next day it fired first time. Thinking is fixed the problem I carried on using it. Today I left home and pulled over a mile away in a petrol garage and when I came to restart it the same thing happened again.

My first thought is a new battery but before I spend £80 for no reason has any body got any other ideas

Thanks

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