As a remote worker in a distributed company, you will have a number of work-related expenses that you can expect to be reimbursed by the company. If there is anything that falls outside the remote work allowance and that costs less than £100, you can just buy and expense it. Purchases up to £250 can be signed off by team admin. For anything higher, you should run them by Tom, Joe, or Noel.
To expense an item, you must have an itemised till receipt or invoice (credit card slips are unusable).