The following lenders have adopted the BSA Mortgage Instructions:
 

• Astra Mortgages, a trading name of Yorkshire Building Society
• Bath Building Society
• Beverley Building Society
• Buckinghamshire Building Society
• Cambridge Building Society
• Chorley Building Society
• Cumberland Building Society
• Darlington Building Society
• Earl Shilton Building Society
• Ecology Building Society
• Hanley Economic Building Society
• Ipswich Building Society
• Leek United Building Society
• Loughborough Building Society
• The Mansfield Building Society
• Marsden Building Society
• Melton Mowbray Building Society
• MBS Lending Ltd
• Newbury Building Society
• Newcastle Building Society
• Norwich & Peterborough Building Society, a trading name of Yorkshire Building Society
• Nottingham Building Society
• Penrith Building Society
• Stafford Railway Building Society
• Teachers' Building Society
• Tipton & Coseley Building Society
• West Bromwich Building Society
• West Bromwich Mortgage Company Ltd