Photographer - Beaconsfield

Hi, My son is getting married on the 17th December. It is a small wedding 10-20 people max. The wedding is at Beaconsfield register office. The ceremony is approx 25 mins. The reception meal is at a restaurant a few doors along from the register office, there is no evening reception.
My Son is on a very tight budget so wasn't going to have a photographer but I think it would be nice so thought I would make an enquiry. Regarding the timing I would have thought a max of 2 hours would be sufficient to take pictures before, during and after the ceremony and a few at the reception, cake cutting etc. Hoping someone is available.