Another pharmacist PhD!!!
All the pharmacists clear days, take off and earn extra wonga. Who wouldn't? Your stipend is tax free and earnings on top of it are taxed as if they are your sole earnings, you probably won't be much worse off at all (so you're looking at ~£13.5K stipend + upto £6.5k personal allowance before tax kicks in). Most PhD "contracts" state that you are entitled to 6 weeks holiday, plus bank holidays and enforced university closure days. Enjoy!
If only someone had told me earlier that counting tablets was so lucrative!