There is no cost to submit an initial request to ‘Ask a Lawyer’. Only if you decide to proceed with a lawyer will you be billed for the work they complete.
You will be provided with a quote before the lawyer starts work; it is up to you whether you wish to proceed or not. Costs will vary depending on the nature of your problem and the work involved.
Typically barristers are significantly better value than solicitors as they are self-employed and don’t incur the same overheads.