Wired doorbell Friedland Type 6 chime

Hi I am sure this is me being daft but I don't seem to be able to work out where to put the connector cable that came with my wired doorbell. The existing setup is a standard door bell that has a cable that runs from the outside door bell into a Friedland type 6 chime and then a cable from that to the low voltage transformer next to the main fuse box. The transformer then goes into the main fuse box. The chime has 4 terminals labelled 0, T3, 1R and F2. I have traced the wires and the ones coming direct from the transformer are going to 0 and T3. The wire that comes out of the chime and goes off to the outside doorbell are on 0 and F2 so 1R has no wire connected at all and 0 has two, 1 from the transformer and 1 to the outside doorbell. So where do I put the connector block that came with it and what wires go what side? Photo attached of how it is now before the ring install.