Venezuelan security forces blocked the three-lane border crossing from the Colombian town of Cucuta on Tuesday using two shipping containers and a fuel tanker.
He recalled that Venezuelan President Nicolas Maduro has repeatedly expressed his readiness for dialogue, but opposition leader Juan Guaido categorically refuses to engage in talks.
Those who settle in Cucuta are often Venezuela's poorest.
Crispin Blunt said Venezuela had been "systematically looted" by the country's ruling class and warned it was the British government's responsibility to seize any ill-gotten gains within its jurisdiction.
Last week, the U.S.
Maduro blames Washington and other Western nations for sabotaging Venezuela's economy, including through sanctions.
Their meeting comes amid massive protests in Venezuela aimed at pressing Maduro, the country's socialist leader, to vacate the presidency.
Pressure is growing on Mr Maduro to step down after more than a dozen European Union countries joined the US, Canada and a group of Latin American countries in recognising Mr Guaido as Venezuela's legitimate leader.
The 35-year-old Guaido, the head of Venezuela's National Assembly, has galvanized the opposition with a hopeful message.
Guaido has described the emergency shipments as a "test" for Venezuela's armed forces, which will have to choose if they allow the much needed aid to pass, or if they instead obey orders.
They have joined the U.S. in pushing for a change of regime in Venezuela, which is now seeing an acute shortage of medicines and hyperinflation despite being an oil-rich country.
Maduro, in response, announced the severing of diplomatic and political ties with the United States.
He said: "We are not beggars".
"We don't want to depend more on a food subsidies than is necessary today", he said, calling the blockade an "absurd reaction from a government that doesn't have the interest and well-being of Venezuelans" in mind.
U.S. Vice President Mike Pence told an audience in Miami on Friday that the United States was ready to deliver aid to Venezuelans.
Venezuela's government said on Monday it would revise bilateral relations with European Union member states that have recognized Guaido as legitimate head-of-state, saying their move would affect relations with Caracas.
With Maduro in control of Venezuela's military and all the territory, getting aid in will be hard, said Jeremy Konyndyk, a senior fellow at the Center for Global Development, who cautioned against politicizing the assistance. The U.S.is not a Lima Group member, but its denunciations of Maduro and its recognition of Guaido are viewed as being in lockstep with the coalition meeting in Ottawa, according to several government sources.