The committee considered the availability of CCTA facilities. It understood that the cost model assumed access to CCTA facilities, but heard from experts that access to CCTA varies across the NHS despite recommendations in NICE's previous guideline on chest pain. Furthermore, because CT scanners are used for many purposes, a constraint currently exists with regard to both the availability of scanners and scanning time. The committee heard from experts that a sizable investment would be needed for the wider implementation of HeartFlow FFRCT, but acknowledged that this consideration was beyond the scope of the current assessment. It understood that adopting 64‑slice CCTA was ongoing in the NHS, in line with the recommendations in the previous NICE guideline on chest pain.