anybody know of any bullmastiff shows coming up in december or january
or am i looking too early

Are you looking for breed specific - general open or championship shows?  and what part of the country

But yes probably bit early :)

open shows anywhere as im willing to travel
and bullmastiff shows only

So you only want breed specific shows ?  I don't know how many Bullmastiff societies there are and how many open shows they run? 

In Gordon Setters there are only 2 breed specific open shows per year in the UK. 

Hopefully someone with your breed can help.

We have 3 classes  scheduled at oakengates cs  in telford on December 18th.It s sponsored by Bullmastiff club

Not sure where you are in the country but there is Luton right at the end of December held at Godmanchester and Boston, early in January, held in Peterborough as far as I am aware they both have classes for Bullmastiff.

There are 6 Bullmastiff breed clubs
British Bullmastiff League
Bullmastiff Association
Bullmastiff Society Of Scotland
Northern Bullmastiff Club
Southern Bullmastiff Society
Welsh & West Of England Bullmastiff Society