Swerve the syndicate option and buy some days from a reputable stalker (plenty on here will be willing to recommend)
You will learn a lot more and you will be more likely to actually shoot deer.
I would even recommend using their rifle for the first few. then you will know what a 308 feels like when it goes off.
Rifles are like cars, everyone has their own opinion on how much they should cost and what brand is best.
A "£100 vauxhall" will kill deer just as well as a "£80k Porsche"...they just cost more to do it.
get a cheap, well made used rifle (easy to find under £300) and a fixed mag scope of decent quality (£50-250 tops) and learn to shoot it well.
chose a cartridge that does what you want it to do with confidence without relying on inch perfect bullet placement. You will miss the point you want more to hit often than you (or anyone else on here) will care to admit.
DSC1 and 2 is IMO not a prerequisite to go stalking.
Get some paid stalks under your belt first and see how you get on before committing thousands to a accreditation that may not be "the one to have" in 5, 10, 15 years time