“…Beginning with the trend for the establishment of UK science parks in the early 1980s, and culminating with the recent enthusiasm for incubators and clusters throughout the 1990s and into the new millennium (particularly fostered by the work of Michael Porter (Porter, 1998)), a set of nested geographical policies based partly on the advantages of external localised R&D networking to internal R&D management has been established. While the principle of a proximity-based development policy has merit, as the reality that HTSFs readily cluster is well established (Oakey, 1985;Saxenian, 1985;Porter, 1998), the notion that such clusters deliver enhanced R&D collaboration through networking is, however, a proposition that is difficult to substantiate, as it is often found by empirical studies to be absent (Oakey, 1985a;Massey et al, 1992;Westhead et al, 2000). It is common for practitioners, charged with the task of promoting HTSF regional development, to encourage firms to cluster and to view the medium-term development of HTSF clusters in terms of stages of development in which there is a relationship between the age of the firm and size of the cluster that is locationally appropriate, ranging from the incubator when nascent, through the science park when entering production and on a local sub-regional cluster when established.…”