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Yeah, the inside is already fully modern. We had no idea that it was so old until the seller told us last week. TBH we were not looking for an older property, but the interior of this one had us fooled. The interior is all smooth plaster painted white. I've seen the listing from 2015 when the current seller bought it and all the plastering had been done then, although they were painted a different colour at that point.
What do you think you'd do in my shoes? I feel like the bodge is almost certainly already made.
There is no 'right' answer here. Either save some money now and risk having an issue in the future, or pay more now and have marginally more confidence in avoiding future issues (to do with breathability).
Generally you should be able to get a feel for how much bodging/modernisation has happened to the property. If everything has already been filled/over plastered then the cheaper paint will make little difference. But if the property is in good 'original' condition then I'd personally avoid becoming the bodger...