Ignore that previous comment. It applied to another 0755 number - they all seem to be the same though: research/marketers and probably still best to ignore and not answer.

I have about 4 calls from this number as soon as I answer they hang up then I ring them straight back and the phone rings out, does anyone know who it is

This number has called me five nights in a row around 19:30 then just hangs up

Real Insurance, rang, hung up rang again.