Moscrops aren't bad, seem to consult the landlord for authorisation where repairs are needed. Eleccy, gas, carpet people they use are great but they tend to use a Liverpool plumbers which, as a tenant, I asked for someone else because they were rubbish so their gas man did the jobs instead. Decorators are ok for complete jobs but a bit rubbish for cheap smaller touch up jobs (eg used matt to touch up satin paint). I think Moscrops are basically responsive to the landlord's requirements, a penny pinching landlord will get a penny pinching job, a more responsible Landlord will get a decent job. Overall from a tenant's aspect I have been pleased with Moscrop's service despite having a bit of a penny pinching landlord.
If you go it alone you may have to register with a deposit protection scheme, some are dear some are free. Dealing with some tradesmen isn't the best way to keep your hair.