allow for multiple theory covmats

validphys2/src/validphys/config.py

@@ -1232,20 +1232,16 @@ def produce_fitthcovmat(
 
         if use_thcovmat_if_present and thcovmat_present:
             # Expected directory of theory covmat hardcoded
-            covmat_path = fit.path / "tables"
+            covmat_path = (
+                fit.path / "tables" / "datacuts_theory_theorycovmatconfig_theory_covmat_custom.csv"
+            )
             # All possible valid files
-            covfiles = sorted(covmat_path.glob("*theory_covmat*.csv"))
-            if not covfiles:
+            if not covmat_path.exists():
                 raise ConfigError(
                     "Fit appeared to use theory covmat in fit but the file was not at the "
                     f"usual location: {covmat_path}."
                 )
-            if len(covfiles) > 1:
-                raise ConfigError(
-                    "More than one valid theory covmat file found at the "
-                    f"usual location: {covmat_path}. These are {covfiles}."
-                )
-            fit_theory_covmat = ThCovMatSpec(covfiles[0])
+            fit_theory_covmat = ThCovMatSpec(covmat_path)
         else:
             fit_theory_covmat = None
         return fit_theory_covmat