Sure, most venues I've looked at so far do blessings on their grounds. A blessing is a half hour service that you can write yourself, or take from traditional texts without mentioning God or religion in general.
I've seen the chapel in Brook Lodge and it's also on the shortlist! I still want to recreate the "church" feel without having the religion aspect. Also, didn't want to just use a hotel conference room decked out to look "bridal", just something a bit special (Brook Lodge seem to be the only venue that can offer this so far).
It never had to be a religious venue - outside would be great if it wasn't for the VERY unreliable weather! I would attach the Drawing Room picture I get from Durrow, but my technology skills are zero! :D