New figures released by the Society of Motor Manufacturers and Traders (SMMT) show a 22.8% year-on-year rise in commercial vehicle sales last month.
However, the rate of future growth is expected to be tempered by economic uncertainty, according to the SMMT.
The total number of LCVs newly registered for the rolling year crossed the 250,000 mark for the first time since March 2009.
New van sales stood at 10,640 in August, while a total of 2,411 HGVs were sold during the month, up 23% year-on-year.
Paul Everitt, chief executive of the SMMT, said: "August saw the strong and sustained bounce-back continue across much of the van and truck industry as operators returned to more typical replacement schedules.
"With the commercial vehicle market up by over 20% for the year to date, the industry is optimistic, but short to medium term economic uncertainty is likely to temper the rate of future growth."
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