Not sure if you're asking for advice, or simply telling us the on-going state of your car...
What were the advisories on the MoT?
If the brakes are suddenly getting worse over just 24hours it sounds like some leak somewhere that started small but is rapidly getting massive - so suspect a split hose somewhere. But in any event check the reservoir first and see if all/most of the fluid has gone.
If it has, then a quick check around the back of each brake back plate should show you where the leak is. If all seem OK, then you need to start following the brake lines from the master cylinder down to each wheel. It could be a corroded or burst/split brake pipe, or might be a union nut coming loose at one of the connectors or junctions.
Also check around the master cylinder itself, to be sure that hasn't cracked or got a loose connection.
Kitchen towel is good for showing up any leak, just reach under the car and press a sheet up against the back of the brake plate. The fluid should be freshly out of the system, hence clean and clear. Anything dirty with lots of grit and grot in it will have been there some time so is probably not your brakes leak.
