Federal W/H is the amount an employer witholds from your pay to send to the Internal Revenue for payment of your taxes on income earned. The IRS, Internal Revenue Service, is the entity that is tasked with collecting taxes on everything you do in the world...birth, death, inheritance, etc. The States have their various taxes too.
I think what you have in England is the VAT...not sure how that works or if that becomes all inclusive of ya'lls taxes................too much tax wherever you are...LOL!