If the XLA is like the XLS, be careful on max tyre clearance, you really can't go bigger than 33c on the XLS (even with 650b it'd be a struggle), it's built for racing.
I can't see it mentioned in the description, where as the Full Monty says 40c and would be better for gravel duties.
Any opinions on this https://www.planetx.co.uk/c/q/bikes/gravel-adventure-bikes/full-monty-SL
Or this
https://www.planetx.co.uk/c/q/bikes/cyclocross-bikes/xla-sl
Not a bad price at £650, and thinking either could have a set of 650b dropped in.