Thinking about the case last night and it occured to me that IS probably never even drove down to the cottage in Broadstairs.
If I remember rightly, he reported Helen as missing in the late afternoon of Friday April 15, after he, allegedly, returned from making a round trip to the cottage on that day. But, in reality, he didnt need to go there.
Also, from the local newspaper reports in Broadstairs, none of the neighbours they spoke with made any comment about him being there, looking for Helen and they surely would have mentioned this, being as a normal worried person would have checked with neighbours as well as searching the cottage..
Yes I agree. If he went there and couldn't find Helen, he could have raised the alarm with Broadstairs police, in case she'd had an accident while out with Boris there.