Do not order SG or GH from snuff.me.uk. unless you order bulk. They only sell them in tap boxes and you WILL be disappointed. You are being far too narrow in you approach. The best recommendation I can give is to try as many different companies and as many different varieites as you can afford. You will soon find some favorites and then we can help you refine your search further. If you are experimenting with English style snuffs, a Kendal Brown, an SP, a Toast and a Rappee are all a must just to see the major styles. Once you go into other cultures the styles become even more diverse. A few menthols, traditional English medicateds, gourmands and florals are also a good thing to try, even though these can be divisive.
As far as the Gawith name, the link provided by @Elwin is a good read. If you want the short version here it is: Samuel Gawith started in the 18th century as a family business. By the 19th centrury one of the Gawith family and a partner (Hoggarth) broke off to from their own company, in the same town - Kendal. They’ve been competitors ever since.
Since British law forbids any oils to be used in snuff, Gawith Hoggarth has contracted with Pöschl in Germany to manufacture and distribute for them the Gawith Apricot and Gawth Cola snuffs. Most German snuffs are oil based. German law is different. There, only non perishable oils (eg food grade mineral oils) may be used. Both laws are actually based on the same premise, however, which is to protect you from using rancid snuff.
Snuff.me.uk is a great source for bulk Samuel Gawith, and their own brand Jaxons. For trying out however, the sampling there should be limited to snuffs that are sold in tins or screw top tubs. Wilsons of Sharrow, Frubourg & Treyer, Toque. Any of the German/Indian/South African/Dutch ones should be safe from there.
Its good that you are asking. Most people don’t. It saddens me greatly when people buy crap and think its themselves that are at fault for not liking it. Most snuff is excellent if bought from the right source or in the right container.