Paying Mileage To A Non Employee

[SimonMac]

Can you pay expenses to someone who is not employed for my Ltd if they are doing work for me?

[Lumiere]

Can you pay expenses to someone who is not employed for my Ltd if they are doing work for me?

why not, when they invoice you tell them to add an extra line for the mileage at the agreed rate (can be any rate, this has nothing to do with .25/.40 rates when a company reimburses its own employees for travel):

configuring mac £900
travel from b'ham to london £100
subtotal £1000
vat £200
total £1200

[SueEllen]

Can you pay expenses to someone who is not employed for my Ltd if they are doing work for me?

If it's agreed in the contract between you and they invoice for it yes.