Congrats!!
There is a Vegas wedding stereotype...Elvis marries you in a drive through. But locals don't do that...I've never been to one.
We have the whole church thing, reception at a country club/ historic house/resteraunt/ hotel ballroom (often off strip), just like everywhere else. If you did that it would be still cheaper. And Vegas does have some beautiful churches, but none like England.
Believe it or not, some casinos have really nice wedding chapels, far from the slots. You can get a wedding, a (small) nice reception with cake, spa for the bride, and sometimes a honeymoon suite for $3000 or so- not bad. There is a store on Sahara and Paradise road that rents very nice, none cheese gowns for far less then buying.
Freeds bakery has excellent cake, not too expensive. They are on Eastern rd. I think? Just ask, everyone knows it!
That's all I can think of for now...I will say if it were me, I would want to be married in the UK over Vegas, but I'm really into history. Good luck either way.