There is no House of Representatives in the UK.
If British media were discussing events in the US House of Representatives, they would refer to a "House committee".
So actually there is no difference between BrE and AmE in that respect. It's like the fact that we don't have a President of Britain, but we still use the term "President" when referring to the US head of state (or certain other heads of state), or the fact that we don't have a House of Representatives, but we refer to "the House of Representatives" when discussing US politics, and Americans refer to "the House of Commons" when discussing British politics.
When a dictionary says "in the US", this isn't necessarily the same thing as saying "in American English".
Indeed, in British English, "subway" isn't usually used as a generic term for underground railways, but we'll still say "the Subway" if referring to the one in New York, and Americans will say "the Underground" or "the Tube" when discussing London.
Sarriesfan is right: the British House of Commons has "select committees". But no doubt their functioning and the details of their configuration differ from those of "House committees" in the US. The two are not necessarily direct equivalents.