Biarritz, Aug. 25 -- British Prime Minister Boris Johnson warned Saturday that getting a trade deal with the United State won't be "plain sailing" because of barriers to the United Kingdom's goods in American markets.

But opportunities abound.

Speaking to reporters as he flew to France for the Group of Seven meeting, Johnson cited examples small and large of British goods that struggle in U.S. markets for bureaucratic reasons.

"It's not just beef or lamb that is currently banned from entering the U.S. in spite of their commitment to overturn that prohibition in 2014. Not a morsel of British beef has entered the U.S. market," Johnson said.

"Melton Mowbray pork pies, which are sold in Thailand and in Iceland, are currently unable to ent...