How long is your tenancy for ? Strimming it all as low as you can & cover it with whatever you can get, cardboard or something to exclude the light, without light plants cannot photosynthesise & become weak ( this can take over a year, weeds in particular can be particularly difficult. If its a farm cottage you must be near a farm, if so & you can get well rotted manure, pile as much of that on top of the cardboard & if you can cover with weed suppressant membrane or tarpaulins or if nothing else black plastic, you can maybe get the plastic farmers use round their bales for hay etc 2 nd hand so possibly free. Just be careful it doesnt shred as then its a nightmare to eliminate. Then start to uncover to plant into the manure when you are ready