Lomax's book ? I've definitely read it somewhere.
He didn't beg them to do anything, in fact when they asked him if he would be able to calm her down he told them she would be apt to shoot him so he didn't want to assist them. That scared them to the point they decided to call for armed help rather than do anything themselves.
He was very calm he didn't plead with them to do anything:
The 2002 Appeal decision says everything:
"Having walked to the house from the lane there was further conversation. The appellant told the police that Sheila Caffell could use a gun. He said they had gone target shooting together and she had used all the guns in the house before. In the light of what they were told the uniformed officers requested armed assistance before any attempt to search the house was made. The appellant dictated a list of the firearms kept at the house. He told the police that he had loaded the .22 automatic rifle the previous night because he thought he had heard rabbits outside. He said he had left the gun on the kitchen table with a full magazine and a box of ammunition nearby. Those who saw the appellant at the scene at that time described him as remarkably calm. At some stage during their conversations that morning PC Myall and the appellant spoke about motor cars. The appellant said that the Osea Road Caravan Site company, "would be able to stand him a Porsche" car at some point during the year."
After nearly 2 hours passed he asked them what they were doing:
"Armed officers from the Essex Police Tactical Firearms Unit arrived at the farm at about 5 a.m. There was further conversation with the appellant. At about 5.30 a.m. he said to PS Adams, "What if anything has happened in there, they are all the family I've got". He became visibly upset and asked to telephone his girlfriend, Julie Mugford, who was later driven to Essex from London."
Is this what you are referring to?