My friend, an Indian national, will be kicking her heels in LHR, for a long layover. If possible, I'd like to meet up with her. This would require her to clear immigration and enter the UK. The LHR website mentions a 24-hour visa available at the discretion of the immigration officer.
She meets the onward travel requirements, but does not have any UK visa.
I can't find any mention of this 24-hour visa on any government web sites. Does anyone know if it really works? Is there a fee and how much?