dont take it is the easy answer
you need to take into account traveling expenses and the time taken to travel verse the amount you are getting paid and from the sounds of it you will be during the week just living to work from awakening in the morning and then by time you get home its straight to bed kinda thing, also you are likely to spend £125 just on traveling which is going to be a hefty chunk of your take home pay after the tax.
Find something closer which may pay a little less but infact you will be taking home more due to cutting down travel costs and you wont have to spend 4 hours per day just traveling