Bernagh Brims

Irish/British author. I am unsure whether she was born in Northern Ireland or the Republic. As with many pony book authors, she was very young when she wrote her first book, being only 15 when she penned Runaway Riders. She was 17 when it was actually published, with its sequel published another two years later.

As well as these two pony books she edited four others, although I don't know if she ever wrote any more novels. She later worked on children's educational programmes for BBC Ulster Radio.

Other passions include music. She has played the flute and the cello with the Studio Symphony Orchestra, an amateur group based in Northern Ireland. 

David and Susan series:

1) RUNAWAY RIDERS
(WORLD'S WORK 1963)
ILLUSTRATED BY JULIETTE PALMER
Published in the USA by Bobbs-Merrill in 1964 with different illustrator Reisie Lonette
Reprinted also as a serial in
The Children's Newspaper in 1964
SUMMARY: Set in Ireland. Brother and sister David and Susan have been training their ponies for the Dublin Horse Show. When their parents go away the crotchety old Aunt who is looking after them forbids them to go, so they decide to ignore her and set out for the show on their own, along with their friends Martin and Clare.

2) RED ROSETTE
(WORLD'S WORK 1965)
ILLUSTRATED BY JULIETTE PALMER
Reprinted by White Lion in hardback.
SUMMARY: The four children now have their hearts set on entering for the Prince Phillip Cup at Wembley.

Collectors info:
Red Rosette is easier to find in the UK than its predecessor, although is by no means a common title. The USA edition of Runaway Riders seems the easiest to find, making it a fairly easy book to get hold of for USA readers. None of the copies seem to be particularly expensive however.