diff --git a/GPy/core/model.py b/GPy/core/model.py
index 8c00667e..42b8287a 100644
--- a/GPy/core/model.py
+++ b/GPy/core/model.py
@@ -422,7 +422,7 @@ class Model(Parameterized):
         to_print.append(super(Model, self)._repr_html_())
         return "\n".join(to_print)
 
-    def __str__(self):
+    def __str__(self, VT100=True):
         model_details = [['Name', self.name],
                          ['Log-likelihood', '{}'.format(float(self.log_likelihood()))],
                          ["Number of Parameters", '{}'.format(self.size)],
@@ -432,6 +432,6 @@ class Model(Parameterized):
         from operator import itemgetter
         max_len = reduce(lambda a, b: max(len(b[0]), a), model_details, 0)
         to_print = [""] + ["{0:{l}} : {1}".format(name, detail, l=max_len) for name, detail in model_details] + ["Parameters:"]
-        to_print.append(super(Model, self).__str__())
+        to_print.append(super(Model, self).__str__(VT100=VT100))
         return "\n".join(to_print)
 
diff --git a/GPy/core/parameterization/parameterized.py b/GPy/core/parameterization/parameterized.py
index 7f67c497..8378b4ce 100644
--- a/GPy/core/parameterization/parameterized.py
+++ b/GPy/core/parameterization/parameterized.py
@@ -405,7 +405,7 @@ class Parameterized(Parameterizable):
 </style>"""
         return style + '\n' + '<table class="tg">' + '\n'.format(sep).join(to_print) + '\n</table>'
 
-    def __str__(self, header=True):
+    def __str__(self, header=True, VT100=True):
         name = adjust_name_for_printing(self.name) + "."
         constrs = self._constraints_str;
         ts = self._ties_str
@@ -416,7 +416,10 @@ class Parameterized(Parameterizable):
         cl = max([len(str(x)) if x else 0 for x in constrs + ["Constraint"]])
         tl = max([len(str(x)) if x else 0 for x in ts + ["Tied to"]])
         pl = max([len(str(x)) if x else 0 for x in prirs + ["Prior"]])
-        format_spec = "  \033[1m{{name:<{0}s}}\033[0;0m  |  {{desc:>{1}s}}  |  {{const:^{2}s}}  |  {{pri:^{3}s}}  |  {{t:^{4}s}}".format(nl, sl, cl, pl, tl)
+        if VT100:
+            format_spec = "  \033[1m{{name:<{0}s}}\033[0;0m  |  {{desc:>{1}s}}  |  {{const:^{2}s}}  |  {{pri:^{3}s}}  |  {{t:^{4}s}}".format(nl, sl, cl, pl, tl)
+        else:
+            format_spec = "  {{name:<{0}s}}  |  {{desc:>{1}s}}  |  {{const:^{2}s}}  |  {{pri:^{3}s}}  |  {{t:^{4}s}}".format(nl, sl, cl, pl, tl)
         to_print = []
         for n, d, c, t, p in zip(names, desc, constrs, ts, prirs):
             to_print.append(format_spec.format(name=n, desc=d, const=c, t=t, pri=p))