Have also had some dodgy tabs here in Leeds SG although I know they were brought down from Newcastle.
Exactly the same effects mentioned here although the print looked nothing like the getafix tabs, much darker imagery but didn't have a clue of what.
Eyes peeled peeps, also if it helps the tabs were thick as fuck and tasted bitter as hell.
seen quite a few of batches of bromo tabs originating in newcastle or thereabouts over the past few years so that would be my gut instinct if the effects profiles match up.