Find a Hydrogen Boiler Installer in the UK

SELECT a.memberID, a.memberName, a.memberURL2, a.memberImage, a.memberDescr, a.categoryString, a.townID, b.countyID, COALESCE(c.isPaid, 0) AS isPaid, c.listingType, a.isVerified AS premierMember, b.place_name, b.county, a.liabilityFile, a.liabilityExpiry, a.idFile, a.addressMatched, CASE WHEN c.upgrdSpokenTo=1 THEN 1 ELSE 0 END AS secondStageInterview FROM ( SELECT memberID, memberName, memberURL2, memberImage, memberDescr, townID, isVerified, liabilityFile, liabilityExpiry, idFile, addressMatched, categoryString FROM members WHERE isActive=1 AND CONCAT(',', categoryIDs, ',') LIKE ',%124%,' ) a INNER JOIN areas b ON a.townID=b.id LEFT JOIN ( SELECT memberID, 1 AS isPaid, MAX(listingType) AS listingType, MAX(expiryDate) AS expiryDate, MAX(upgrdSpokenTo) AS upgrdSpokenTo FROM listings WHERE listingType>=0 AND expiryDate>NOW() GROUP BY memberID ) c ON a.memberID=c.memberID GROUP BY a.memberID ORDER BY isVerified DESC, listingType DESC