If you do not mind being tied to it for the next 12 month, this is a good price after reward card. There might be a chance to get £11 from TCB as well, as the link from TCB also includes the reward card at the moment.
Prices may rise annually - full details here
Mobile contract providers tend to increase your monthly tariff by inflation - and exactly which measure depends on the network:
Three: a Fixed Annual Price Change, 4.5% this year. O2: RPI plus 3.9%. EE, Vodafone: Consumer Price Index plus 3.9%.
The date of the adjustment also varies by provider:
Three: April O2: Announced in Feb, effective from April EE: Announced in Jan, effective from March Vodafone: Announced in Jan, effective from April
What is Sim only?
SIM only is just that, where you only pay for the minutes, texts, and data you use on your sim-card.
You will have to supply your own device i.e phone/tablet to insert the sim-card into, hence why it's called 'sim only'