Development of Site BA4 would not by itself to justify additional infrastructure, but the total number of homes proposed for Sites BA2, BA3, BA4 and BA5 exceeds the threshold for a strategic housing site (para. 1.3 of the Local Plan) and requires appropriate additional infrastructure. This is not made sufficiently explicit. Existing infrastructure (schools, health care etc.) operates close to capacity, so the additional infrastructure needs to be provided at an early stage. Given that the existing Clothall Common development has little infrastructure the new provision should be situated within the enlarged Clothall Common area.