7 years ago I charged £83 per hour. Minimum 1 hour then by half hour thereafter. Travel time was also fully charged (many clients a five hour drive away so I had to) although I did try to solve problems on the phone, sometimes they still wanted me out. Reminds me of the "my monitor has gone pink" - no matter what I said, they wouldn't wiggle the VGA cable, so 3 hours later I got there, seated the cable correctly and left 5 minutes later.