Many thanks to Chiffchaff - and congratulations on combining so many elements into an extremely enjoyable puzzle.
Right, now I have to get a cider brine made for the turkey crown, prep the veg and make mince pies, the latter task accompanied by the Festival of Nine Lessons and Carols. At least that is dependable - Radio 3 seems to have completely lost its cultural compass this season, offering wall-to-wall schmaltz (and why is an apparently hourly appearance of the Skaters waltz obligatory?)
Happy Christmas all.