A very tidy unit.

Thank you again for all the great comments! They've all been a pleasure to read.
The passion here is admirable.

I did connect my garage desktop speakers to the radio. Kept the dim bulb in circuit so power at circa 160V to the transformer.

After around 40 years of hibernation, the unit has worked perfectly. I haven't heard AM for decades; the AM sound is quite amazing. I've had it running for hours. The smell of the valves has brought me back to my early teens playing Led Zeppelin IV through this very amplifier...

Its a nice clean sound. Has to be the valves. I have a Luxman mid 80's 'Hybrid' amp (LV105u) which features 2 valves for the mid range; its a sweet amp also and has the valves visible through a sight glass on the front. They're beautiful, why hide them..

This Australian radio is an absolute testament to the quality of electronics at the time; I know some bits were Japanese in it and this is a basic unit but it is just so beautiful to watch and admire. Looking at the radio tune the stations had my kids (in their early 20's) and myself in awe. Bit of a bids nest underneath but all beautiful nevertheless!

I have taken all your expert advice and will just be connecting in a Wi-Fi board of some description. I have seen one that may suit and would be keen to see your feedback on the below. About $209AUD on AliExpress:

https://www.arylic.com/products/up2stream-hd-dac

Next is fixing the tape deck and the Garrad 'pickup'.

I'm pretty sure my dad paid either $25 or $45 dollars for it in 1969; I can't exactly remember the number.

Looks like a nice unit, and should "just work". Low-value Japanese electros of the period would most likely have gone short-circuit by now, but those filter caps should be fine.

It's just the rubber bits that might need a close look at.

Lovely unit.

my dad paid either $25 or $45 dollars for it in 1969

Adjusted for inflation that's $367 or $660 in today's money (Source: RBA)

'Good enough' Bluetooth boards are very cheap. They can be powered from 5 volts DC derived by rectifying and regulating the 6.3V AC filament supply.

After seeing the pictures, I am very happy that you will keep the unit in original condition with as little modification as possible. As Brad suggested, keep any changes reversible so you can get back to original.
It is an excellent example of a top-of-range radio.

The 'Rola' speakers don't excite me. They'll need to go.
Why replace the speakers with probably less efficient speakers that were probably designed for an enclosed chamber and may not match the impedance of the Rolas. Stick with Rolas, as the designers intended.

Harold

No need to change any caps in that unit.
Anocap polyesters and Elna electros.
It's good to go!