The police inquiry into Sir Cliff Richard came under mounting criticism after Dominic Grieve, a former British attorney-general, called its handling of the case "odd" and "very questionable".
Grieve, who left the Cabinet last month, accused the police of colluding with the BBC in a move which led to the search of Richard's home in Berkshire being filmed by the corporation.
Grieve, the most senior politician so far to cast doubt on the police tactics, suggested that the South Yorkshire force might even have been acting in breach of national guidelines in making public its investigation into an allegation that the singer sexually assaulted a boy at a concert almost 30 years ago.
The chorus of criticism grew with complaints by senior lawyers, politicians and fans that Richard was now being kept in a "cruel limbo" while police decide what to do next.
Richard, 73, remained in his villa in the Algarve, Portugal, with his manager, long-time companion and sister offering support. Sources close to the singer said he had yet to be formally asked to return to Britain for a police interview.