The Johnson Brothers' Old Britain Castles pattern was popular from 1930 to 2003 and is available in pink and blue colorways. 

The pattern depicts 45 different castles as they appeared in the 1700s, and was created by artist Miss Fennel using engravings and book photographs. 

After 2003 Johnson brothers was no longer produced in England.

There is a wide array of pieces available with not only the pink & blue but also Lavender was added at some point.

These 4 cups come in mixed condition. Having several different pieces of this pattern myself I do see there is a color difference in some of the same pieces and if you are familiar with this line you know for the Bowls and plates there are different backstamps throughput the time it was made.

While these 4 tea cups all depicts Avon 1797 on one side and Penhurst 1792 on the other. This set of 4 does have a matching tone of pink none really lighter or darker then the others.

Unfortunately 2 cups have been repaired where it looks the handle had broken off and on has severe crackling inside. Overall the transferware on these are all a pretty dark pink to almost red. Showing minimal signs of fading with almost any fading by the top rim of the handles.

The set I have handled has a whole array of mismatch of ages and even probably factories where they were produced. So to find all 4 teacups with the same shading was a little surprising. And of course the teacups only have the imprint indicating made in England. So only can nail down they were before 2003.