Provider override service 132 access to C&W Homeconnect, ok on BT, not on PN

[#1]

My phoneline has just been switched from BT Retail to Plusnet and the C&W Homeconnect override service which is used by my employer to pay for all business calls I make from my domestic line has ceased to work. C&W have confirmed that everything is setup at there end. They suggested I check with Plusnet as they may need to something to allow this overide service to work.
Any advice anyone? Anyone else using the 132 access code?

[#2]

Carrier pre-select services such as this should work fine with our service without us needing to do anything. Can you tell us what's happening when it fails to work?

[#3]

It is now working, thank you. Must have been a settling in period 🙂
What was happening for a short while was, I dialled 132 followed immediately by the full number I wanted to call (as I always have done) and after a brief period, it returned to the dial tone.