Found this bargain at my local Wilkinsons store, great price & great fun!!
Bath Time Buddies - Wet ‘N’ Stick Alphabet Set - Jar filled with 65 coloured foam letters that stick to the bath when wet.
Fun letters for bath time fun and learning, plastic jar filled with 65 colourful foam letters that will stick to the side of the bath or tiles. The jar has plenty of vowels allowing the spelling of many words. Making bath time educational and fun!
The lid of the jar is punched to allow the letters to be stored and drain after use ready for the next bath time.
My son loves them, I emailed and asked about availability and was told they are widely available at most 'larger' stores with toy departments.