PAYE but "Home Worker": Tax Breaks?

hello all

i will soon be starting a new job, where the company is based a long long way from where i live. i will be working away from home a couple of days a week, as well as making phone calls/admin/etc from home. so essentially my home is also my main office base.

now while i guess that phone bills will be covered, what about heat/light/etc. is there a form of words that my tax office will understand to tweak my tax code up?

thanks