I've received razor blades from the US on several occasions and not had a problem.
Imported stuff only gets flagged to UK Customs if the value label is greater than £18 around $30, if it's a gift then this value doubles to £36 (I think). Once greater than £18 VAT (Value Added Tax) at 17.5% is added plus Duty 5-8% plus the PO handling fee. But I donbt the brush you are sending is worth more that $30,
[SIZE="1"]Ah... You can't beat the cold steel and the badger. All this electrical rubbish, little wheels spinning around all over the place for callow youths and peach fluff, Not for a man's beard. Razor blades for men! I think we'll have this on number 9. If you're going to have a shave have a close one!
Tony Hancock, The Bedsitter, 1961.[/SIZE]