A brother and sister have each been remanded in custody for sentence after admitting an early-morning robbery of a Havelock North service station.

Appearing in Napier District Court on Friday were William Valentine, 29, and Renee Valentine, almost 28, both of Hastings.

Each had previously pleaded guilty after accepting a sentence indication of probable home detention relating to events that Judge Geoff Rea said were "about as far down the scale as you can get" when it came to the range of aggravated robberies.

There was understood to have been little or no planning for the events which happened early in the morning of May 26, a prelude to a spate of dairy, service station and bar robberies that have plagued Hawke's Bay since cigarette and tobacco price increase were announced about 12 hours later.

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Each had been granted bail within days of their arrest but had been in the custody leading up to Friday's appearance because of breaches of the conditions of their bail and other matters.

Reminding them that while they had been told they could get home detention, Judge Rea said the starting point for calculating their sentences when they next appear on November 22 will still be prison. "You've done about all you can to muck it up yourselves," he said.