You need to get an application in to the local court urgently to ask for the warrant of eviction/possession to be suspended on terms.(posted 7234 days ago)As to whether or not you will be successful by offering £1000 now and the remainder over a period is completely down to the judge on the day and it could possibly swing either way.
You will get an urgent appointment before the judge - probably arranged over the phone, so that if your application fails, then I am afraid you will lose your home. You can minimise the likelihood by going to the court hearing armed with figures and possibly your £1000 in cash to slap on the table there and then.
Good luck!