If you look at an up-to-date VFR chart of the UK, you'll see NEDUL and ORTAC and KATHY on there, which I take as an invitation to use them on VFR FPLs to the Channel Islands. Likewise, TRIPO and JACKO and LOGAN, RINTI and DEVAL and many more.
I've never had a problem with submitting a VFR FPL with RINTI on it, which I do regularly when going to Calais, or with DEVAL when going to Le Touquet. Doesn't mean it's "right" (I have no idea about that), but it works.