Having spoken to several SMEs part of the gripe isn't just that they're only left crumbs from the public sector table. SIs will often subcontract specialist work to small businesses and take the lion share of the profits themselves.
I've also heard cases where SIs have said it would not be in their interest to work with small companies, as they don't want a quick and innovative solution but something which creates long drawn-out contracts, enabling them to keep milking the public sector cash cow.
I had an interesting chat with Chris Chant, responsible for setting the strategy for the use of cloud computing, who believes moves toward the cloud will help break up the 'oligopoly'.
"We've got to recognise that some of the organisations we outsource to are as big as the civil service, so why would we expect agility with something that big," he said. But with a lengthy legal contract lock in still in place, the cloud panacea still seems a long way off for the moment.
And of course, it's important not to underestimate the power of these contractors, many of which have account managers with one-to-one relationships with people in government that SMEs simply don't have.
"These providers are used to getting a certain amount of money from the government and they can't afford for their shareholders to lose out by reducing their income in the area of public sector contracts. So of course they will push back against change," says Mark Taylor, appointed by the Cabinet Office to lead its New Suppliers to Government working group.
If the government is to change the entrenched culture of awarding contracts to a few large suppliers, it will need to recognise it will have a fight on its hands. The question is, will it be able to back up it good intentions with the necessary action?