As an Asian person... no question it's worth it. I got some of the frozen minute rice on a whim and it was just disgusting. Expensive rice cookers definitely make rice a lot better with more consistency. I use this which is probably the cheapest rice cooker you should consider. It's fine, but the switch usually flicks off before it's done cooking, so I have to leave it on keep warm for about 15-20 minutes before I can actually eat it.
But when I use my mom or sister's rice cookers at home, the rice always turns out fantastic. If you eat rice at least every other day it's definitely worth the investment.
I'm not sure if you can get it in the UK, but I got my Zojirushi 3 Cup Japanese rice cooker from Amazon and it's one of the BEST $50 I ever spent:
Zojirushi NHS-06 3-Cup (Uncooked) Rice Cooker https://www.amazon.com/dp/B00004S575/ref=cm_sw_r_apan_glt_i_V1EA0ARXZZWD78587QVV?_encoding=UTF8&psc=1
This is perfect for my 2 person household. Simple, fast, efficient. My boyfriend got it for me as a joke since I love mini versions of things but it’s probably my most used appliance.