Sorry for the re-post didn't set my pc clock correctly first time

Short Version.

Does anyone know if you can replace MEM type 1 M6 5A 51QEB circuit breaker
with a 6A type C. Will it fit the DIN rail and not foul the cover?

Long Version.

The consumer unit is manufactured by MEM and fitted with rail mounted type 1
breakers.

The lighting circuit has now become subject to nuisance tripping when a
light bulb blows. So I want to try replacing the breaker. However being an
old type its causing problems.

If this were a more modern unit with a 6A B breaker It would be easy to
first try changing it for a 6A C breaker (about £5)

However the type 1 are difficult to source and piece more expensive (£17.64
Newey and Eyre)

Thanks

BillP