The link above confirms that ING Direct NV is part of te UK scheme. You need to be aware though that "ING" and "ING Direct" are no more than trading names. All large modern banks have many subsidiary companies and it is important, if you are concerned, to determine exactly who your investment is with.
For example, ING Bank (Australia) Limited also trade under the name "ING Direct" but investors there will be covered by whatever depositor guarantees Australia offers rather than being included in any UK scheme.