I'm so sorry for your loss, that is a young age to die these days, you must still be in shock, and miss him badly. Don't be afraid to weep.
You should be able to manage on your pension plus your job, so hopefully there will be no immediate worry, but in the long term, after you give up work, you may have to make adjustments to your life style. Lots of people manage on a single pension but overseas holidays or cruises will probably be out! I would plan to keep working as long as possible, to fill your time, for the company, and to build up your savings to cover future large expenses such as major car repairs, new boiler or appliances, etc.
If you notify your local council that you now live alone, you will get a discount on your rates. Sooner or later it will help to write out your expenses including any annual payments for insurance etc, and divide by 12 to see if you can live within your income or if not, what changes you can make. Don't make any decisions yet about major changes such as moving etc, give it at keast 6 months or a year, as you will go through a lot of changing emotions as you grieve. In the future, if you run short of money, you can obtain a significant lump sum, with no repayment costs, by taking some of the equity out of your property. Interest will build up on it and keep increasing the amount owed, but the total is only repaid when you pass on, and you can still move house without repaying it. This is a good last resort to keep in mind, it is good to know it is an option, but it would deplete what you have to leave to your family (or to the state if you end up in care).
Wishing you all the best at this hard time. ?