You might like just simple and easy to fix , super long term low maintance toilet set.
May Be you need a replacement.
Here at MKK with still sell this Traditional toilets.
 
Ceramic Cistern with chrome metal flush handle
Toilet seat Reinforced wood layed plastics
Low level pan.
 
Please note items are sold separatly e.g
Cistern  £110
Toilet     £80
Seat       £40