HI Op,
l am a landlord, l really think your best bet is to invest in another property as realistically anywhere you invest you are not likely to get a return above the rate of inflation, so your nestegg may be shrinking year on year.
I realise it seems like a big responsibility but l invested in my first letting flat at 22 and it really was not hard and has given me a really good return with little hassle over many years.
Things to beware of,
Go for a freehold small 1 or 2 bed house ideally, as then you will not pay service charges ( which can be very expensive and are not in your control) and can simply do repairs as needed. If not possible then a leasehold flat with over 100 yrs on the lease and in really good condition.
Period properties need lots more maintenance, so a nearly new build is ideal, totally new means you will pay a developers premium, but 1-5 years old is ideal (bit like a car you pay a LOT for brand new) but don't want old either.
Must be close to good transport links, and within a 5 mile radius of large town. Simple trawling of rightmove will identify where gives a good return....
Lastly never believe anything an agent tells you, do your own research online re prices of properties and rental returns.
Consider full management, but hammer down the % you pay at the start before signing the contract, and make sure you do not pay for renewals if a good tenant stays for years.
It is quite a bit of work to start ...research, buying and then finding the right agent but once that is all done you can be fairly free of it.
Also as mortgages are so cheap currently you could get a 50% BTL mortgage and buy a better property...with a better return...if you do this l would fix for 5 years now.
It really is worth doing this now for future security...good luck