Our latest BIS Bulletin has details of our new BIS 20 Challenge, a prize winning competition to make records in the unrecorded squares in Powys and Brecon Beacons National Park. There are 131 monads, or 1km OS map grid squares in the BIS area for which we have no records. Our challenge is for you to make at least 5 records in any of the unrecorded squares before the end of September 2021. This is a prize winning BIS 20 Challenge as we celebrate our 20th anniversary. A £50 NHBS voucher is on offer to those who complete the challenge and are drawn out of the 'hat'.