The service was led by the County Guide Chaplain, Rev Marilyn Sharland. Robin Healey was organist and the lesson was read by Sheila Llewellyn. A retiring collection, together with the units' contributions, was for the Guide Thinking Day Fund.
Following the service, tea and cake was served in the Wesley Hall where there was a display of memorabilia from as far back as 1927.
"Many photographs were taken, memories recorded and friendships renewed. It was a very successful event and it is good to see the present units flourishing and carrying on the proud tradition," said a spokesman.
The gathering was the culmination of many weeks of planning by Ruth Jordan, Mrs Karen Jenkins, Mrs Janet Bennett and Mrs Denise Davies.