I have recently replaced the following Red and a Black SR fuses with the latest Blues and are now available.
1 X 20mm X 5mm Red 3.15A slow blow £35 + £4 pp
1 X 20mm X 5mm Red 4A Slow blow £35 + £4 pp
1 X 20mm X 5mm Red 4A slow blow £35 + £4 pp
1 X UK Mains Red 13A SOLD
1 X 20mm X 5mm Black 4A slow blow £66 +£4 pp
Ta Muchly.