Hi DSTechnicalManager,
I am from a UK based certification body who conducts audits to START, as well as full BRCGS Food Safety and others.
Going for BRCGS START first is a very sensible option, especially as part of an overall plan to eventually achieve full Food Safety certification.
START comes in 2 levels, Basic and Intermediate. Basic is around 33% of the Food Safety Standard. Intermediate is around 66% of the Food Safety Standard. Typically a Basic audit will take 8 hours and an intermediate audit will take 12 hours.
The full BRCGS Food Safety Standard is a very significant step up from SALSA, so there are a number of sites that will first implement START basic and maybe have that for a year or 2, then to go START intermediate and have that for a year or 2 and then go for the full Food Safety. You may have a really strong technical team at your site so may so straight to intermediate and skip the basic step and that is okay too.
Let me know if you have any further questions and if you'd like I can reach out to you directly to give you an idea of price etc if we were to conduct the audit.