Do you mind me asking how long you had been waiting on the 103 before you switched to the CPV?
We only applied for our 103 in March. I don't really relish having to pay another initial vac and filling in another form, especially as it's the same form and you just need to tick a different box. We were going to switch to the CPV a bit later on when we have the funds, but are worried that they might considerably increase the 2nd VAC on 1st July so had thought of applying for the temporary CPV to begin with. There has been some speculation about this on PIO. I have emailed the PPC with the same query, but they seem very slow to respond at the moment.