I believed the government changed the law to make clearance fee’s legal quite recently,
I must say though that bill is ridiculous, I understand VAT & Customs charges etc… but seriously for £0.33, bit of a joke!
You’ve got really unlucky there, my advice pay the bill and take it as experience.
I would suggest the stress Parcelforce will give you will not be worth the £11.25 saved,
On the other hand, if your going to fight it, best bet it to go to the depot it’s stored at and pay the £0.33 in cash and request the release of your parcel, otherwise they can quite easily ‘fob’ you off over phone, email etc…
Hope some of that helps