Handycap
Assistant Pro
I guess no-one has the answer, unless everyone is sticking with the 8 iron idea.
8 iron out of the 2nd cut? with a close cut pin.....I don't reckon that's the answer.
Homer's original reply differed from the 8 iron idea by favouring a lob wedge with an open stance. This has to be the best method of getting it close from the scenario you describe.
When Phil Mickleson plays this shot he has the benefit of a championship course groomed over the last 6 months for the occasion. In general, everyday golf on the average UK course isn't like that. Additionally, the variety of grasses used in the UK are different to grasses used on courses in the States. The above may sound pedantic, but you may be being too hard on yourself!
Unless you have the benefit of getting the club head through the grass without getting "caught up", which is affected by the density and consistency of the grass, then even Phil may struggle to knock the ball dead!
Edit
Credit where credit's due: Murphthemog was the first to suggest the lob wedge idea ahead of Homer.