UK Pension

[OzMan]

I worked for about 25 years in Australia and about 5 years in the UK, where I was born. Because I retired in Australia, I receive about 5 years' worth of pension from the UK and, theoretically, 25 years worth from Australia. Because my assets are greater than the Australian threshold to receive a pension, I only receive a small pension from the UK and nothing from Australia. Can I move back to the UK and claim a full UK pension that takes into account both the 5 years I worked there and the 25 years I worked in Australia? If I had retired in the UK this would have been possible, but can I now switch if I return to the UK?