An enabling policy environment certainly helps to get both momentum and continuous improvement in social procurement. Here's a summary of just some of the social procurement policy instruments in the UK

By Tania Pouwhare, Social Intrapreneur, The Southern Initiative
A 2011 study found that half of all contracting authorities (i.e. all bodies governed by public law such as councils, central government departments etc.) across Europe included socio-economic clauses in their procurements. It was most widespread in the United Kingdom (more than 80% of contracting authorities included these clauses), followed by the Netherlands and Norway (70%). Poland and Slovenia were least likely to include socio-economic clauses; only 30% of their contracting authorities did so. (Maybe Poland and Slovenia have upped their game in the last seven years but even at 30% they're still much further ahead than New Zealand). Many European countries have national policies and plans that enable and promote social procurement, including Austria, France, Denmark, Germany and Belgium, reflecting the “growing policy interest in re-orienting public expenditure towards solutions that are more compatible with environmental sustainability, promote social policy considerations, or support innovation” (p.4). And they do this within the confines of European procurement rules for the single market which are far more complicated than New Zealand's.
The UK has several public policy instruments requiring a social procurement approach, with Scotland, Northern Ireland and Wales having particularly robust policies.
UK country specific instruments are:
> Public Sector Social Value Act 2012
Places a duty on the public sector in England and Wales to consider social outcomes in the procurement of services (but not goods or works).
> Procurement Reform (Scotland) Act 2014
Places a duty on the public sector in Scotland to secure social, economic and environmental well-being, and opportunities for small- and medium-sized enterprises (defined as having fewer than 250 staff), when procuring goods, services or works.
> Wales Procurement Policy Statement
Expects the community benefits principle (including social, economic and small- and medium-sized enterprise outcomes) to be applied to all Welsh public sector procurements of goods, services and works where these benefits can be realised. Outcomes for all contracts greater than £2 million must be reported to the Welsh Assembly.
Requires social outcomes in all Northern Ireland public sector procurements greater than £2 million for construction and greater than £4 million for civil works. Northern Ireland's 'Buy Social' approach will be piloted in services contracts with a value exceeding £500,000. The PGN sets out how social and economic outcomes will be considered as either a non-price attribute (core requirement) or contract condition (non-core requirement). Departments can add their own social or economic goals and extend the inclusion of the Buy Social model to any contract irrespective of value.
At regional and local government level, research in 2016 by Social Enterprise UK found that 1 in 3 English councils routinely considered social value in their procurement and commissioning, and 1 in 4 had a social value policy (the report also makes very good points about the importance of legislation compared to guidance). High rates of councils in London and North East England were 'embracers' or 'adopters' (some examples are the Greater London Authority, Manchester City Council and Croydon Council.)
Policy or strategy in itself does not deliver impact or change, after all, a tool is only as good as its user. But it can help tackle lethargy, especially when coupled with targets. Most importantly, it provides mandate for those who want to pioneer a new way of doing things.
The United Kingdom has an enabling policy environment. European countries do too. So do Canada, the United States and Australia. It all begs the question as to why we are so far behind in New Zealand. Answers on the back of an envelope please...