Police had previously found insufficient evidence after Barclay declined to be interviewed. English had told police Barclay had told him he had left a dictaphone on in his electorate office and had recordings of Dickson.
It is illegal to intentionally intercept private communications you are not a party to. English said he would fully co-operate if police re-opened the investigation, and had not sought legal advice.
"I haven't sought legal advice and there's no need to. Again, I have nothing to add to what's been said. Are there questions about anything else," English said, before being asked if the scandal would take votes off National in September's election.
"I've just said I've got nothing to add, are there questions on anything else."
Yesterday at the National Party conference English made the further admission that Barclay had offered to play him the tapes. He said he did not take up that offer, and denied advising Barclay to wipe the recordings.
In television interviews on the weekend English suggested five times in two television interviews that "the fact of the recordings has never actually been established".
Before Barclay became MP, Dickson had worked for English, who held the Clutha-Southland seat for 18 years before becoming a list MP.
Amid rumours of secret recordings, former electorate chairman Stuart Davie last year texted English asking about the claims. English's February 21 response said Barclay had left a dictaphone running and picked up all conversations in the office.
He subsequently made his police statement, and released that last week after Newsroom published his text to Davie. English's texts and statement were entirely redacted by police when they released documents to the Herald under the Official Information Act in March.