You are likely to be talking about a Defined Benefit pension.
This is a pension scheme where the annual pension paid to you - the defined benefit - is determined by the scheme rules, not by how much you have paid in to the pension.
Your statement shows the annual pension payment which is due to you at the Normal Pension Age (NPA) of the scheme. If the scheme allows and you take pension earlier, then you get less annual pension.
The transfer value represents what the pension scheme would pay if the pension was moved to another pension provider. Moving from a defined benefit scheme to a defined contribution scheme means you end up with a pot of money, which you have to then control how that is used.
The Financial Conduct Authority has decided that any pension transfers, between defined benefit and defined contribution schemes, of £30,000 or above, have to be done with professional advice. This decision has been made following past events, were people have lost money from doing moves of this type. The advice for this type of pension transfer, can run in to many £thousands as there is a lot of liability on the adviser, thus high adviser insurance premiums. The outcome of the advice may be not to transfer the pension.
FCA has some videos for consumers about pension transfers: https://www.fca.org.uk/consumers/pension-transfer-advice-what-expect
Whilst £600 per year may seem low, you may get that at age 60.
You may live until you are age 92.
That £600 per year may be index linked, so grows by perhaps CPI each year.
Long term average of CPI I do not know but lets say it is 4%.
£600 at age 60, would be around £888 at age 70, £1314 at age 80, £1946 at age 90.
The pension provider guarantees to pay you each year, regardless of how well investment markets are doing.
If you transferred the pension to a defined contribution scheme, then you have a pot of money which is invested, and you can take out what you like, when you like, within some limitations. If you took £600 the first year, then increased that by 4% each year, then it might last until your 90's or it might not as it depends on how well the investment does. If you took a chunk of money initially, then you do not have much invested, so that does not grow much, and you are more likely to run out of that money before for your death.
Transferring from a defined benefit scheme to a defined contribution scheme needs a lot of things looking at, thus why you have to get financial advice if the value if £30k or higher. Not all financial advisers will advise on defined benefit pension transfers.