When the original SKY installer came to do mine he couldn't even be
bothered to measure the complete run of cable (straight run) and
instead joined 2 cables with f-types. That's how much they are
concerned about it.

For Sky there will no noticeable difference. If you want to pick up
weak satellite stations then it may make a difference.

What you need to consider more is the length of the cable run and to
make sure that any joins are water sealed with self amalgamating tape
or similar.