I agree with Devora. Plenty of people are matched through BMP, but the respjse you will get from SW really varies. I used it, and whilst I did get some responses and potential links, you may never hear anything after enquiring on a child, or eventually get a short 'sorry, they've already been matched' email
My DD2 was in BMP, but by the time the magazine came out I had already been linked with her. So not all the children who appear in BMP (or in CWW) are actually available. The agency can buy the child a 3 month slot or so if they wanted, but if they are linked early on, then the child may continue to appear in the magazine
You don't have to be approved to buy the magazine (or now buy a website subscription which they didn't have when I was last looking) or enquire about a child. I know my LA do get a couple of copies of BMP which they share with prospective adopters as a tool to get them to think about what kind of children are waiting. It is upsetting but maybe useful to you. I am pretty sure BMP will let you buy just one copy actually, so you can look, but your agency may do like mine and get a copy just for that. I know some people who are very near approval do actually use it and start enquiring on children, although the childs SW may not want to look at anyone who isn't approved
Having said that, agnecies do have differing policies on BMP, some don't like their adopters to subscribe until so long after approval, others don't mind and let you straight away. So when you get into HS, so ask the SW what they advise...just to avoid ruffling feathers
Devroa is right - it can be an upsetting read. But still, I do advise subscribing if you are looking for children that may be harder to place. It would be rare for a young white british child without many issues to appear in it, but there are plenty of children aged 4-6, sibling groups, children with disabilities, and black children of any age.
Their website has some very short public profiles anyone can look at, if you haven't already
AdoptionUK also have a waiting child magazine (Children Who Wait) which people are matched through, there is the National Register Devora mentionned, and there are also exchange days, both adoption register ones and consortium ones, which some people attend. So plenty of options to be proactive if you have a supportive agency