My experience of this factoring company (Hacking and Paterson) has been very poor; examples:
1. Insurance premiums way above other companies; when asked to provide details of the other quotes they got they refused to release the details, or our own policy breakdown.
2. Lying - saying to the owners of one flat that letters with quotes for a job have been sent to all the flats when in fact no one else has received them. Saying jobs have been attended to when they clearly have not been.
3. Being obtuse and obstructive.
4. Long waits on simple jobs.
I know that this is anecdotal and that Factoring companies generally are poorly rated, but I would avoid this company, and we found changing factors was quite straightforward (though H&P were obstructive).