Hi Paul, please you liked my idea of a cake plate!
According to Wiki, Madeira wine, which is a fortified wine, was at the height of its popularity in the 18th century, and at the end of its popularity c. 1850 when beset by some cultivation disease.
Its popularity in UK probably encouraged by the British fleet, under Nelson, occupying Madeira during the Napoleonic Wars, leaving in 1814 ish.
Ratafias were also another name for liqueur type alcoholic drinks, flavourings infused in alcohol and left for some months (a bit like sloe gin) and often home made and the almond ratafia biscuits an accompaniment to them.
Rather think both of these were seen as 'ladies drinks' and perhaps considered slightly more refined and genteel than spirits. Sipped as an occasional small glass with snack, between meals, rather than consumed as a means of becoming blotto! Also, the nature of both alcohols meant that they could both be kept for months once the bottle was opened without deteriorating.
Regency period with its simplicity, neo classical lines and the great days of the aristos undertaking Grand Tour of Italy, Greece etc. would surely tie in with Greek Key design of plate? I know design continued in popularity until Edwardian times but when was it first utilised in ceramics, glass, jewellery, woodwork and architecture in UK? Probably around this time but I couldn't give you a date.
Veronica