I don't know where Lowfat gets his information from but it is not accurate.
If the aircraft are not being used for commercial purposes there is no requirement for 145 approval. The Light Aircraft Maintenance Program (CAP 766) Section 3 is the guide here.
I normally carry out the B1 part of an annual myself and subcontact a B2 for the radio work.
The main issue is not certifying the inspection work but ensuring that the paperwork can be presented and is accceptable for an ARC.
I produce a package including the B2 work which goes to the organisation issuing the ARC which does need an approval. In theory I suppose I could apply for the approvals myself but as the volume of work is low and I have a great working relationship already it seems not worth the expense or trouble.
I have carried out work in this manner since light aircraft maintenance went over to the EASA system without a problem.
In addition 50 hrs and fault rectification are also covered in the same way. Keeping the paperwork in order is the key and that is actually the operators responsibility.