You know your boss's name.
Look up his/her home address on the internet.
After sundown, dress up in all black. Wear a hairnet under your ski mask so you don't lose any hair at the crime scene, and wear latex gloves under your drivin' gloves so you can be damn sure you don't leave any fingerprints or skin flakes. Wear shoes that are two sizes too big and stuff newspaper into the toes.
Walk -- don't drive -- to your boss's house. If your boss has a family, make sure they're all in bed. If you Brits are like us Americans, there should be a phone box -- or a Network Interface Device -- around back of the house. Go there and rip out all the wires. Go back to the front door and bang on it like the gestapo.
Whoever answers, grasp both sides of their skull and twist sideways and upwards as hard and fast as you can. When you hear a snap, that means you broke their neck. Let them drop, no one can survive bone shards and fragments embedding themselves deep into their spinal cord. If it's not your boss, go on inside and finish everyone off. If it is your boss, stomp on his/her face until it's a bloody, pulpy mess. No family wants to have a closed-casket funeral. Go find the kitchen and get the longest, sharpest knife you could find. If there's family still in bed, slice everyone up; start with the spouse since they'd still be up waiting for their unfair-dismissing honey to come back to bed.
Find all the cash you can, and consider it part of your final paycheck. Go home and start washing your clothes non-stop. When you get the house to yourself, stuff them all in a garbage bag with kitchen waste and burn it outside.
You're welcome.