Newbie to the group

Hello both, very exciting indeed!
I don't know Benidorm very well at all, but generally never use the Abogado (@ solicitor) recommended by the estate agent as this could lead to a conflict of interest however quicker, easier and cheaper you may be told it will be. If you have any concerns whatsoever, ask your Abogado to check them out and do not rely in any way on information from the estate agent. Never give a deposit to an estate agent as there are thousands of properties for sale so there really is little need for a holding deposit. Make all inquiries about a property in writing.
If there is any possibility at all that you may consider renting it out in the future, read up on the Tourist Licence.

The rules also apply to friends and family unless the rental is totally free of cost to them. There have been a lot of illegal holiday lets in the past and the authorities have really tightened up on this. Holiday lets can cause problems for neighbours so they may well notify the police if their peace is disturbed too often.
If you will be renting a car make sure you have allocated parking.

You will need NIE numbers which will probably be easier to get from UK and to open a Spanish bank account. When you consider banks think about where the nearest branch or ATM is as there are charges for withdrawing from other bank's ATMs and most banks charge for their services, especially for non-residents, in the region of €30 a quarter. You will need to set up direct debits for community fees, IBI (council tax), waste disposal, water and electric (standing charge @ €30 a month?). Looking at previous bills, especially for electric, may not give much of a guide on future bills if it has been empty for several months, and yes, I fell for that one! Think about how easy a particular bank's site is to use, how to set it up to use from the UK (a few posts recently of having difficulty accessing) and the availability of English speaking staff.
Some holiday home owners use a keyholder. They offer a range of services including cleaning, linen changes, regular inspections and being able to react quickly should an emergency arise (such as a water leak). Holiday home insurances often have restrictions on how long the property can be left and if there is a problem, the damage (and their bill) will only get worse the longer it is left. They can even provide an essentials parcel for when you arrive.

There are companies who can provide on demand packages for TV and internet and there are various electric packages available. Plan noche is very popular as it provides cheaper electric from late evening until lunchtime so you can have your air conditioning on overnight and do washing drying and heating the water etc at reduced rates. From October through to March/April you will need heating.
It may be worthwhile getting a Spanish SIM card for when you are here as some companies will not ring you on a UK number.
Another very useful set of guides; Jim's guides - your complete guide to SpainThis includes advice on paying your annual non-residents tax which is likely to increase post-Brexit. On that subject it is possible that Brits will be limited to 90 days in 180 so another topic to keep an eye open for will be the Schengen area rules.
Buying and selling property in Spain is very expensive so it really does pay to take your time and my advice would be to check what it is like in August and February. In August much of Spain closes down and heads to the coast and in February you will see it at it's quietest and although Benidorm is an all year round resort some facilities will still close down and some complexes could be very quiet indeed.

Apart from Jim's Guides, mentioned above, another couple of helpful sites are Citizens Advice Bureau Spain for many of the queries that you will have and the N332 site for anything to do with driving in Spain.   The latter is run in collaboration with officers of the Guardia Civil for English speaking people and has an English version of the Spanish equivalent of the Highway Code.

Also be aware that many provinces and town 'tweek' the rules and regulations for their own procedures, and be aware that many things may change after the 31st October.

Hi, not sure if i only was lucky but me and my wife bought in Villajoyosa (just outside benidorm) we bought through a swedish agency HusmanHagberg located close to benidorm. Amazing service, smooth guidence through all procedures. They are English an Spanish speaking. I highly recommend you to contact Leo Lopez or Cecilia Martinsson at husman Hagberg agency if you like to have a realestate agent that truly listens and cares about you.