It is worth the denarii
If you're a professional pilot, then act like a professional. You don't have to buy a uniform, you don't have to pay for much once you are working as a professional pilot. If you could afford hundred of thousands for flight training are you seriously saying one of £60 is unaffordable to you.
Trust me when I say I understand what it is like to have no money but a log book is a tool for your whole career and a bad one will cost you a shed load of time. Just fork out for a one off decent log book after doing your research like sky log pro or log10 pro etc Just be wary of formats. Not all work PC/Mac/iPad/android so think about how you want to make and maintain entries not just now but into the future as changing downstream can be very very tedious (I know I spent 4 weeks full time moving logbooks when I went to Mac in 2010!