Question r.e. polling station.

Just voted. There was a reform stall about two foot from the polling booth. The person that registered me to vote and gave me the poll card was sat with the reform people laughing and then got up, went inside and dealt with me. I was unable to get my card into the box fully as it was over-full.

There were reform signs all over the place and a total of six reform people stopping you as you went in.

It is very scary that there is so little scrutiny. I have never experienced such a party presence before.

Is this all acceptable/ legal ?