Oh good, I was worried I'd committed some newbie faux pas.
I have a CIM (charted institute of marketing) advanced certificate in marketing which does seem to exist any more. I'm thinking it needs to be something that was a year of full time study though, which this was nothing like. An old OU link gives it 55 credits which equals 550 hours of study.
My husband is being a bit too optimistic, looking at Google partners Adwords and analytics certification. I don't think that'll be worth anything.
I don't imagine anyone will have any specific thoughts on these, it's a bit too niche!