Sometimes you don't want to spend a lot of money on a toilet seat.  

You also don't want to waste money on something that breaks after Aunt Berta and the kids stay with you for the weekend...

This technoplast white toilet seat is durable, functional, fits most UK pans and will get the job done for a great price:

https://www.replacementtoiletseats.co.uk/ourshop/prod_6300651-White-Tecnoplast-Plastic-Toilet-seat-by-RTS.html