Sales through the government's G-Cloud framework fell 5.3 per cent in July month on month, according to data published by the Crown Commercial Service (CCS).
The latest figures - which were delayed - show that sales in July reached £62.2m, compared with £65.5m in June.
Currently in its eighth iteration, the G-Cloud framework aims to make it easier for public sector bodies to procure cloud computing services and products from a select group of suppliers, decided during a bidding process.
Nicky Stewart, commercial director at G-Cloud supplier UKCloud, said a slight downturn was expected after the disruptive impact the EU referendum had on the government.
"You had the run-up to the Referendum and you had Brexit and the shocking outcome from that, which meant that civil servants would generally have had their attention diverted to the broader issues around Brexit," she said.
"Departments have different governance but if it's a big purchase, generally it will be signed off on behalf of a minister and sometimes ministers will have to be involved in that approval process.
"The fact you've got a new government and changes of ministers always amounts to a massive amount of work, so the fact that the drop is only slight, given the time those figures cover, is quite positive."
Total sales through the framework now stand at just under £1.4bn, with £1.06bn coming from central government and just £73m from local government. The remaining sales come from the wider public sector and not-for-profit organisations.
Chris Swani, head of public sector at reseller and G-Cloud supplier Bytes, said that more could be done to raise awareness of G-Cloud among local government bodies.
"It is something that central government do look at more," he said. "Whether it's down to advice from the Cabinet Office a few years ago with Cloud First - that may well be a driver and certainly central government takes more advice from the Cabinet Office in that respect.
"However, we have done sales with local government and they are asking more about it.
"It probably just needs a little bit more promotion on our part and probably from CCS as well, but I can certainly see it accelerating in the future."
Preparations for G-Cloud 9 are expected to be ramped up over the coming months and Swani added that he would like to see the framework changed slightly, so that products can be added to a supplier's catalogue at any time, not just during the bidding process. He explained that suppliers currently have to turn away business if a buyer is looking to use a service through G-Cloud that was not in their catalogue at the time they were awarded a place on the framework.
Both Swani and Stewart said they had spoken with the CCS about the possibility of changing the framework to accommodate this, but Stewart said the regulatory changes would be complex.
She added that there has been some speculation as to whether the G-Cloud framework will become a Dynamic Purchasing System - key differences of which are that suppliers can constantly change their catalogue and new suppliers can join at any time.
"There has been some lobbying, and certainly the kind of messages which have been coming out from CCS are 'we're really interested in this but it's quite difficult to do'," Stewart said.
"I don't know where their thinking will go with that [but] generally we would certainly be supportive of it. It would be great to have the flexibility to be able to refresh your services.
"Another advantage would be that there would be a lot more transparency because all suppliers on a Lot would have to be invited to bid, but when you look at the kind of scale you have with G-Cloud where you have hundreds of suppliers on a Lot, that would be quite scary for a buyer."
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