Last month's article was all about number crunching and by completing that exercise in the same Analyser (IPA) you can enter the fixed-up value and monthly rent, recording the source of both pieces of information as a comparable for valuation purposes.
I mainly use the 'for sale' and 'last sold' features on Rightmove looking for comparables within a radius of 1/4 mile (neighbourhood) and at most just 1/2 mile of your property's postcode. There are some other equally reliable, up to date websites with 'for sale' and 'last sold' data. It is just that I am very familiar with navigating my way round Rightmove which saves me time and makes the exercise less stressful.
Also (in the IPA), I have included a range of non-standard features on the Area Analysis page which should have a positive effect on the valuation and may not exist in any of your comparables. It is for you to decide the percentage value of each up-lift because they will vary from one location to another.
Another point to remember about anticipated values, both fixed-up and rental, is that you may be bringing to the market a 'new' property, possibly the only property in the immediate neighbourhood (1/4 mile) which has all the features that you have built-in to your fixed-up property.