This has all started after Ride London 100, i then carried on cycling in to work every other day thats a 40 mile round trip but now all of a sudden i genuinely can not be arsed.
Maybe all i need is to do a couple of miles just to get the legs moving....
This is a common topic, so firstly, you are not alone.
Sounds a little like you may have overdone it. Plus commuting is...whilst fun...slightly souless and relative. So its a good way to start to see riding as a function rather than as fun.
My advice is generally to find a way to rekindle the love. For me that's a break from commuting and adopting slow (like sub 10mph) rides on the single speed to a coffee shop or pub on a Saturday. Take it easy, pootle about, forget that you are riding and remember what it was like being a kid and using the bike to just get about.
If you can avoid kitting up that might also help, I also find that daunting sometimes...such a faff.
Where as jumping on the ss in jeans and a shirt, for a slow ride for a coffee is very appealing.
Also try to set a ride event with friends, so that you cant talk yourself out if it.
If all that fails, chill. There are no rules of entry, you will always be a cyclist.