Thanks again for your input and no it does not sound negative, like you I am a sceptic, but also a realist and as I have not had any other offers to publish (I have been sending off manuscripts since September 2010), I am beginning to think that any published work is better than none, particularly as I have two further ideas for books to write.
I actually know of an author of another book published by Apex, he too was an ex prison officer and his book was absolutely slated by the staff at nearly all the prison I worked at. He has now gone on to have go publicised a few book about the prison service (none of which I feel is wholly accurate but very sensationalistic, unlike most staff's experience. He has also been on a few TV programmes. This was why I sent my manuscript to Apex.
I will study very carefully any contract they offer me and will keep the forum informed.