Be very careful, UK house prices are very high, and they cannot keep rising forever - if you stick there for 5-10 years then you will probably do fine, but if you need to move in say 3 years you might have a problem.
Interest rates are LOW now - be wary.
There are two types of flats, conversions and purpose built.
Conversions can be rather nice, but you can have problems from noise, people mis-installing washing machines and flooding you, ditto you flooding other people.
Purpose built flats can be quieter (if the floors are concrete rafts).
With flats you have to pay for communal maintenance, venal landlords buy up cheap freeholds so that they can use their own maintenance companies to fleece the flat holders.
With a house, you have your own roof and are not beholden to anyone, possibly you also have your own garden. Noisy neighbours can be a problem, especially with older Victorian cottages. Beware of single skin brick walls.
I suggest that you and Mrs Jim settle down and write out a list of things that you would detest, and work out how you would check for them.
I live in a flat, a Victorian conversion, in a popular area abut 15 miles from central London. In my twenty years I’ve had my kitchen flooded from above three times, my bathroom once, my main bedroom once and my spare bedroom once (all different causes and occasions). We have had neighbours from Hell twice - well two and a half times, and noise has been a problem a few times - although my ultimate sanction is to join the party.
I’ve also had problems getting access to tarp bits of roofing.
On balance it has not been so bad, and since the choice was a small Victorian cottage, I don’t think I would have done otherwise.