surveyed as up to date on all requirements along with a fresh annual
Did you buy it with a fresh annual? Call me a cynic but that's no guarantee.
You don't say if this is your first aircraft but, if it is, you need to form a relationship with a maintenance organisation and with a CAMO.
No reason why you should not look after everything yourself but most maintenance organisations will want to check what is due themselves - more because they always have done this from before the time of EASA rather than not trusting you. They really don't trust any owners.
You will still need a CAMO to issue the ARC every year and they will also (because it is part of the ARC) check everything themselves. The ARC will be more expensive as they will need to do this every year instead of every three years.
You might find that you are not actually saving very much compared to £55 a month.