British boxing officials are urging anti-doping officials to sort out Hughie Fury's delayed case before his WBO title fight with Joseph Parker.

The delays with the anticipated fight continue but May 6 in Auckland looks the likely date, rather than the initial April 1.

But a cloud hangs over the fight with Fury, along with his cousin and former world champion Tyson Fury, still having an alleged positive test to banned steroid nandrolone hanging over them since 2015.

Both deny taking the banned substance and have blamed their positive tests on contaminated meat. There has been no confirmation over their B sample tests.

The British Boxing Board of Control has urged the United Kingdom Anti-Doping authority to get the matter sorted out, with suggestions of an April hearing.

"'We entrust UKAD with all our anti-doping procedures and we are very disappointed this matter has still not been resolved. We have frequently corresponded with UKAD, asking them to hold the hearing and very much want them to do so now, at the earliest opportunity," Robert Smith, secretary-general of the BBBC told the Daily Mail.

Smith fears Fury, the mandatory challenger, could be compromised if he beats Parker to win the WBO title formerly held by his cousin, without a resolution in the delayed case. A subsequent ban would bring the result into dispute.

"It is problematic for all involved if a boxer is allowed to fight while the findings of a drugs test are unresolved."

Parker's handlers at Duco Events are aware of the situation and, if a ban is placed on Fury in the leadup to the fight date, they are confident they have contingency plans in place to keep their fighter active against a worthy opponent.

The Fury camp face further problems ahead of the fight if it is confirmed for New Zealand.

Peter Fury, father and trainer to Hughie, faces his own battle convincing New Zealand immigration authorities he is fit to enter the country after serious drug convictions from his past.