Birds, in my town, all longer-acting contraception is done at one centre. It is on the 'deprived' estate. Which from any other area of our town requires two buses each way, in the evening (clinic runs from 7.30-9pm). It's hard to get a babysitter at that time of night, the buses don't connect very well, and as they give no appointments and it is first come, first served, you may not even get SEEN on a busy night. Which you won't know until the end of the clinic. That only runs once a month.
Not all PCT's offer the same level of services, Birds.
And though my friends and I may not live on the 'deprived ward' of our town, there are still plenty of people on this estate that would fit the bill. Services like you are on about are only available on that one estate. Our Children's centre is closed down now.
We have to catch two buses each way to get to the closest Children's centre, so can't access any of the groups due to school runs.
I accept that where you are, the services may be far better, but they AREN'T in this area. And it is mostly due to that that I can count at least 12 families off the top of my head that have 4+ DC's.
Logistics DOES make a difference. The suggestion of making access to long term contraception similar to blood donations might help in our area, if it was daytime. The problem with a lot of these clinics is that they run in the evening to make time for those that work, but they don't run in the daytime, which would be far easier for the unemployed Lone Parent to get childcare for!