Basically, older children can have liquid calpol but you'll need to give them several spoonfuls, or you can try tablets, if they will swallow them. DS (12) still has trouble with swallowing tablets, so I tried the horrendously overpriced calpol fastmelts, which did work for him, but must be one of the most expensive ways of buying paracetamol...
exexpat - as your DS is 12, he can have the hot lemon drinks. They can contain a lot of paracetamol, store own brand ones often have 1000mg. Useful though for older children/adults who don't like tablets.
why can't you have Calpol over the age of 9? DD1 (17) swears it's better than paracetamol tablets as the pink sparkliness makes you feel better more quickly . And I've been known to swig have a couple of spoonfuls when hungover needed (before anyone starts, yes, I do check qualtiies of paracetamol so as not ot overdose, and am a lot more careful with the DC).
Surely paracetamol is paracetamol regardless fo the overpriced quantities of pink sparkliness?