Elderflower cordial (and Camden tablets??)

With the elderflowers in full bloom, I have been out picking this morning and have my first batch of cordial "brewing"....it is so refreshing on hot summer days, so thought others might like to try...collect about 35 flower heads - preferably the ones that look almost "buttery", but not those already losing flowers if you shake them.Once home, rinse them gently in cold water to make sure no insects are on them. Meanwhile, dissolve 1.5 kilos of sugar in 1.5 litres of boiling water and leave to cool,,,,in a sterilized bucket, large jug, bowl whatever. (If you can't put the receptacle in a hot oven / microwave, then fill with water and a spoonful of bleach, leave for 5-10 min then rinse well).After that, add the flowers plus 2 oranges and 2 lemons - all cut up roughly and squeezed a bit as you put them into the bucket. Give it all a good stir, then cover with a clean cloth and leave for 72 hrs. At that point, strain the water through a sieve lined with muslin or another "thin" fabric (scald it with boiling water first). Add 50-60 g of citric acid (you can buy this easily anywhere locals might go to get the stuff they need for wine-making) stir again and leave for 24 hrs. Sieve again - or better still siphon off and bottle. Glass bottles are by far the best, treat like jam jars to sterilize. The closed bottles will last for at least 6 months, although you should check from time to time to see if they have started to bubble a bit, in which case open (over a sink or bath...it really can POP) to let the gas escape and close again. Once open, keep in fridge. To drink, use like squash....also nice drizzled over ice-cream, fruit salad etc, and even to make a vinaigrette.As to the camden tablet???? Anyone know what they are called here... If I could find them, using one tablet per gallon of liquid (when adding the citric acid) means that the cordial will last more or less indefinitely.This year am also going to try an elderflower liqueur...someone gave me the recipe.Snip 15-20 flowers into a large-ish mason jar or similar, cover with vodka and leave in cool dark place for at least 1 month. Strain, return to jar and add 1/2 cup of sugar. Continue to keep it in a dark cool place, but give the jar a shake every day. Once the sugar has dissolved - apparently it is ready to drink!Last year I also made elderflower champagne...the locals thought it quite bizzare...but were also quite impressed!! Great fun.