Hi Pablo, nice boat!
I ended up getting the Capelli 5.7m with 100hp Yam, which together weigh 670kg.
Someone else may have more precise weights for your setup, but I can't imagine you'd be over my weight, so maybe around 600kg?
I have a Rocca 851 braked trailer for mine, rated to 1100kg. My Honda CRV is 2100kg total authorised weight (PTAC in French) so I just squeeze under the 3500kg maximum limit for trailer and car combined. (Above and you have to have an 'E' permit, extra test, etc. to tow a heavier load). Not sure what the UK rules are for max. towing weight with a normal licence.