Toyota Urban Cruiser 1.33 - Soft clutch - rednblue

My Urban Cruiser has been experiencing issues with the clutch.

A few months ago the clutch went soft /spongy. The only way to change gear was to pump the clutch a number of times.

A garage bled the clutch thoroughly and it then worked for a couple more months. However, then the problem returned and I took the car to a garage.

The garage replaced the master cylinder. The clutch worked for a couple more weeks but now the same symptoms have returned.

I would be really grateful for any thoughts on what the likely (and possible) underlying issues might be.

Thanks!

Toyota Urban Cruiser 1.33 - Soft clutch - rednblue

I should add that there has not been any obvious sign of the clutch fluid leaking.

Toyota Urban Cruiser 1.33 - Soft clutch - Bolt

I could be wrong but apart from slave cylinder, may be duel mass flywheel if fitted?.