Fix Factory access panels are the best you'll find on the web & the UK Market including Standard Access Panels with flush metal doors & flush frames.
Access Panel - Standard/Economy - Flush Metal Door - Flush Frame - 150mm x 150mm
Access Panel - Standard/Economy - Flush Metal Door - Flush Frame - 200mm x 200mm
Access Panel - Standard/Economy - Flush Metal Door - Flush Frame - 300mm x 300mm
Access Panel - Standard/Economy - Flush Metal Door - Flush Frame - 450mm x 450mm
Access Panel - Standard/Economy - Flush Metal Door - Flush Frame - 600mm x 600mm