I charge a standard rate of £30 per hour and track my time with Toggl. Minimum charge is for one hour and the hourly rate is billed in increments of 15 minutes, with time rounded up or down to the nearest quarter of an hour.
For one-off projects, it is often better to charge a set fee. This would depend on the scope of the work and can be agreed during the consultation.
Please call me on 07817 190 714 for a free consultation or email me.