As many have said buying a full racing bike for commuting doen’t make sense you would be much better with a light touring /audax bike with mudguards and rack. The good news is for £1000 you could get a pretty good one take a look at kinesis, pearson,paul hewitt,thorn to name a few.If it was my money Id go for a kinesis, a few people on club rides have them and they are cut above the usual hack training bike eg Ribble.