Options
Fixed duration bonds - lock the money away for a year - NS&I have a 4% fixed bond for example.
Notice accounts - where you give notice before withdrawing the money - coukd get 3 point something % percent. Common to have 30 or 90 day notice periods.
ISAs - cash ISA the interest will be tax free - Although you may not pay tax on savings interest anyway, see what the annual allowance is for savings interest. ISA would be good if you may not use all the money for house purchase, as once it's in the ISA wrapper it can stay there forever, so if you don't use it you have option of switching to a stocks and shares ISA later. Up to 20k per person per tax year.
LISA - if a first time buyer meeting certain criteria - check carefully before putting money in as penalties if you take out for other reasons. Can put 4k of your yearly ISA allowance in, and government will top up by 1k.
Premium bonds- any winnings are tax free, but of course you may win nothing.
None of these will keep up with inflation, but will be better than a low interest account.
Don't have more than 85k per person per institution/ banking licence- check FSCS rules.
Stocks and shares ISA/ LISA - more volatile, so money may be less when you take it out. If holding longer term e.g. over decades, is expected to increase above inflation. But risk for only a few years investment thst it may be less than you put it in if stock market dips.
Money Saving expert website good for looking up different savings rates.
I would definitely not use a financial advisor for this. Research the different options yourself. There are no hidden options for them to tell you about!