You can get in small qtys mixed with paracetamol 5/500g otc from a pharmacy.
Under the name metomax or anagraine.
This is a s3 control substance and legal for purchase without a script only after talking with a pharmacist. Different from a s2 pharmacy only med. They have to run you through it, but if you get migranes and nausia along with it they wont ask many questions, if you straight ask for it nor.ally they just assume youve had it before and just give it to you.
Only issue is large amounts of paracetamol but 1.5x max dose for 2 days i cant imagine would do any ling yerm damage, liver might just hate you for those few days. And i guess if all goes to plan it wont really matter.