If your hearing aids look like the ReSound Nexia and your charger looks like the ReSound charger , then your Specsaver hearing aids are rebranded ReSounds and connect for streaming only via MFi , ASHA and BT-LE-Audio.
→ NO classic Bluetooth connection for streaming from PC
If you keep the Resound aids then you could get a Bluetooth dongle which support the new BLE-Audio standard, and connect the hearing aids via the dongle to your PC for streaming audio.
For connection to Android phone: Your Android phone need to support ASHA or BLE-Audio.